Wind-power and hydraulic generator apparatus

A wind-power and hydraulic generator apparatus has a wind power device, a drive device, multiple pump devices, a reservoir device and a hydraulic device. When the wind blows, the wind power device generates and stores electricity and the drive device drives the pump devices to pump water into the reservoir device. Then the reservoir device generates a water jet enabling the hydraulic device to generate electricity. When the wind does not blow, the electricity stored in the wind power device still enables the water to circulate and to generate the water jet. Whether the wind blows or not, the water of the reservoir device can keep circulating to generate the water jet and the hydraulic device can keep generating electricity. Accordingly, the wind-power and hydraulic generator apparatus can use wind power to generate a water jet.

Multilayer-type fan device

A multilayer-type fan device has a base, a major blade group and at least one minor blade group. The base is circular and has a top, a bottom, an external surface, an axle hole and at least one inclined plane. The external surface is formed around the base at the bottom of the base. The axle hole is formed through the base from the top to the bottom of the base. The at least one inclined plane is formed on the base between the external surface and the top of the base. The major blade group is mounted on the base and has multiple blades mounted on the external surface of the base at intervals. The at least one minor blade group is mounted on the base and has multiple blades mounted on one of the at least one inclined plane of the base.

FILTERING APPARATUS

A filtering apparatus has a tank, multiple filters and two brackets. The tank has a hollow main body and a tubular overflow mounted on the main body. The filters are respectively connected with the tank beside the overflow. Each filter has an extension spring and two joints. The joints of each filter are respectively mounted around two opposite ends of the extension spring. The brackets clamp the filters. Because the flow of bulky effluent in the sewage is blocked by the extension springs, the sewage is restrained by the filters. 1. A filtering apparatus comprising: a hollow main body having an inner space and an outer surface;', 'a tubular overflow connected with the outer surface of the main body and communicating with the inner space of the main body; and', 'multiple connecting tubes connected with the outer surface of the main body and communicating with the inner space of the main body;, 'a tank having'} an outer surface;', a first end;', 'a second end opposite to the first end of the extension spring; and', 'a helical gap formed through an outer surface of the extension spring and between the first end and the second end of the extension spring;, 'an extension spring having'}, 'a hollow first joint mounted around the first end of the extension spring of a corresponding one of the filters, wherein the extension spring is in communication with the tank via the first joint; and', 'a second joint mounted around the second end of the extension spring of a corresponding one of the filters and having a closed end; and, 'multiple filters respectively connected with the connecting tubes, each filter havingtwo brackets securely connected with each other and clamping the outer surface of each filter.2. The filtering apparatus as claimed in claim 1 , wherein two boards parallel to each other; and', 'two posts, each post having two opposite ends respectively and securely mounted through the two boards of the bracket; and, 'each bracket has'}the two boards of each bracket ...

Air activating and air cooling mold device

An air activating and air cooling mold device utilized to process a workpiece includes a mold and an intake device. The mold has at least one gas channel disposed therein, and each of the at least one gas channel has an inlet and at least one outlet. The inlet is disposed on an outer surface of the mold. The at least one outlet is disposed on the outer surface of the mold, is spaced apart from the inlet, and communicates with the inlet. The workpiece is disposed on the mold and covers the at least one outlet. The intake device is mounted to the inlet of the at least one gas channel of the mold, such that gas is injected into the mold via the inlet and flows out of the mold via the at least one outlet.

Toe-cap molding machine

A toe-cap molding machine has a body, a clamping device and a shoe-tree mount. The body has a base panel, a connecting mount, a clamping cylinder and a shoe-tree cylinder. The clamping device is detachably connected to the body and has two quick-release groups and a mold group. The quick-release groups are securely mounted on the assembling panel, and each has a quick-release mount, a clamping mount and a first spring. The quick-release mount has a releasing hole, a holding pin and a mounting recess. The clamping mount is pressably connected to the quick-release mount and has an engaging block, an elongated hole and an engaging head. The mold group is connected to the quick-release groups and the assembling panel and has two guiding shaft, a limiting panel, two second springs and a clamping mold. The shoe-tree mount is detachably connected to the shoe-tree cylinder below the clamping device.

SEWAGE PURIFYING APPARATUS

A sewage purifying apparatus has a first pump, a coarse filter, a second pump, a first centrifugal filter, a third pump, a second centrifugal filter, a fourth pump, a secondary filter, and a storage tank. The coarse filter is connected to and communicates with the first pump. The second pump is connected to and communicates with the coarse filter. The first centrifugal filter is connected to and communicates with the second pump. The third pump is connected to and communicates with the first centrifugal filter. The second centrifugal filter is connected to and communicates with the third pump. The fourth pump is connected to and communicates with the second centrifugal filter. The secondary filter is connected to and communicates with the fourth pump and has multiple filtering elements. The storage tank is connected to and communicates with the secondary filter. 1. A sewage purifying apparatus comprising:a first pump for drawing liquid;a coarse filter connected to and communicating with the first pump to filter the liquid;a second pump connected to and communicating with the coarse filter to draw the liquid after the coarse filter;a first centrifugal filter connected to and communicating with the second pump to filter the liquid after the second pump;a third pump connected to and communicating with the first centrifugal filter to draw the liquid after the first centrifugal filter;a second centrifugal filter connected to and communicating with the third pump to filter the liquid after the third pump;a fourth pump connected to and communicating with the second centrifugal filter to draw the liquid after the second centrifugal filter;a secondary filter connected to and communicating with the fourth pump, and having multiple filtering elements to filter the liquid that flows out of the fourth pump sequentially; anda storage tank connected to and communicating with the secondary filter to store the liquid after the secondary filter.2. The sewage purifying apparatus as ...

Shoe last for air activation and air cooling

A shoe last for air activation and air cooling utilized to heat and activate as well as cool and shape a semi-finished shoe made up of a midsole and a vamp includes a body, at least one inlet, and at least one jet outlet. The body has an outer surface. The at least one inlet is disposed on the outer surface of the body. The at least one jet outlet is disposed on the outer surface of the body, is spaced apart from the at least one inlet, and fluidly communicates with the at least one inlet. The semi-finished shoe is sleeved on the body and covers the at least one jet outlet. Gas is injected into the body via the at least one inlet, flows out of the body via the at least one jet outlet, and is ejected to the semi-finished shoe.

Fan device for high torque output

A fan device for high torque output has two base plates, multiple fans, and a spindle. The base plates are mounted parallel to each other. The fans are mounted between the base plates, and each fan has an inner side, an outer side, and an inflection point. The spindle is connected with one of the base plates and is located at a middle position of the base plate. A connecting line that connects the inflection point and the spindle is out of an area defined between a connecting line that connects the spindle and the inner side and a connecting line that connects the spindle and the outer side when the inflection point, the inner side, and the outer side are located at the same horizontal plane. Therefore, each fan has a large frontal area to be pushed by fluid.

Multifunctional wind power green-energy apparatus

A multifunctional wind power green-energy apparatus generally includes a carrying base, a plurality of wind power generation devices mounted on the carrying base and includes a plurality of blade sections, and at least one electricity accumulation device, water pumping motor, and the air storage device arranged at one side of the carrying base and electrically connected with the wind power generation devices. With such a structural arrangement, through simple combination of the carrying base and the wind power generation devices, terrain limitation conditions for availability of wind power green energy can be reduced to the least for applications to diversified environments. Through operations in combination with the electricity accumulation device, the water pumping motor, and the air storage device, accumulation of electrical energy or direct use of the energy can be available. As such, the utilization of the wind power generation devices can be improved.

Soil irrigation and restoration method and system of the same

A soil irrigation and restoration system comprises a water transmitting device having a water containing tank, a water pumping element, and a pipe. The water containing tank has a containing space formed therein. The water pumping element is disposed in the containing space and has at least one water inlet, a water outlet, and an overflow portion. The water outlet is spaced apart from the at least one water inlet. The overflow portion is disposed between the at least one water inlet and the water outlet, and is disposed at a position higher than that of the at least one water inlet and the water outlet. The pipe has a connecting end connected to the water outlet. A portion of the pipe away from the connecting end extends downwardly and is buried in the soil layer. A soil irrigation and restoration method executed with syphon effect is also provided.

HYDROELECTRIC SYSTEM

A hydroelectric system is disclosed. The hydroelectric system may include a water reservoir, a water channel, a plurality of power generating units, a water pumping unit and a cover. In one embodiment, the water reservoir is on the ground and capable of receiving and storing water, such as a pond, lake, ocean or the like, and the water channel can be spiral and located underground. The power generating units are spacedly disposed in the water channel and when blades thereof are struck by the water flow, electricity is generated. The water pumping unit is connected to a bottom section of the water channel and the water reservoir respectively, and is able to pump the water in the water channel back to the water reservoir. In an exemplary embodiment, the power generating units can be disposed and operated in geographically flat areas. 1. A hydroelectric system comprising:a water reservoir on the ground;a multi-layered power generating module comprising:a spiral water channel located underground, wherein position of the water channel is lower than the water reservoir, and the water channel has a top section and a bottom section, the top section of the water channel connected to and communicating with the water reservoir; anda plurality of power generating units spacedly disposed in the spiral water channel, wherein each power generating unit has a power generator and a plurality of blades, and the blades are rotatable and secured at a base of said power generator;a water pumping unit connected to the bottom section of the water channel and the water reservoir respectively to pump the water in the water channel back to the water reservoir; anda cover disposed on top of the water channel.2. The hydroelectric system of claim 1 , wherein the water pumping unit includes a plurality of water pumps claim 1 , a reflex pipe and a reflux pump; the water pumps spacedly disposed in the water channel and below the power generating units; the reflex pipe having an inlet end and an ...

EXHAUST PURIFICATION SYSTEM

An exhaust purification system has a centrifuge filter, a first fan device, a second fan device, a pump, and an ozone generator. The centrifuge filter has a container having a waste gas treating area and a wastewater treating area. The first fan device communicates with and draws gas into the waste gas treating area. The second fan device communicates with and draws the gas out of the waste gas treating area. The pump communicates with and draws wastewater from the wastewater treating area. The ozone generator communicates with the pump and introduces ozone into the wastewater inside the pump. A part of the ozone dissolved in the wastewater is released to the waste gas treating area to react with the gas, and the other part of the ozone dissolved in the wastewater reacts with the wastewater. 1. An exhaust purification system comprising: 'a waste gas treating area and a wastewater treating area;', 'a container having'}, 'a centrifuge filter having'}a first fan device has an interior communicating with the waste gas treating area of the container and drawing gas into the waste gas treating area;a second fan device has an interior communicating with the waste gas treating area of the container and drawing the gas out of the waste gas treating area;a chimney communicating with the second fan device and discharging the gas introduced from the waste gas treating area of the container;a pump has an interior communicating with the wastewater treating area of the container and drawing wastewater into the wastewater treating area of the container; andan ozone generator communicating with the interior of the pump and introducing ozone into the wastewater inside the pump;wherein after the wastewater and the ozone dissolved in the wastewater are introduced in the wastewater treating area of the container, a part of the ozone dissolved in the wastewater is released to the waste gas treating area to react with the gas inside the waste gas treating area, and the other part of the ...

DRIVING FAN DEVICE

A driving fan device has a transmission device and multiple blade assemblies. The transmission device has a transmission seat disposed at a center of the transmission device. The blade assemblies are mounted on the transmission seat. Each one of the blade assemblies has a fixing portion and a tilting portion. The fixing portion is mounted radially on the transmission seat and has a pivotal end and a groove. The pivotal end is disposed away from the transmission seat. The groove is caved inwardly near the pivotal end and has an inner surface. The tilting portion is pivotally connected to the fixing portion and has a rotating part and a forced part. The rotating part is disposed at the tilting portion, is pivotally connected to the pivotal end of the fixing portion, and has an abutting surface corresponding to the inner surface. The forced part is connected to the rotating part. 1. A driving fan device comprising:a center; a center; and', 'an outer surface; and', 'a transmission seat disposed at the center of the transmission device and having'}], 'a transmission device located at the center of the driving fan device and having'} [ a side surface;', 'a pivotal end disposed on the transmission seat away from the outer surface; and', 'an inner surface; and', 'a groove caved inwardly on the side surface of the fixing portion adjacent to the pivotal end and having'}], 'a fixing portion mounted radially on the outer surface of the transmission seat and having'}, two ends;', 'an abutting surface corresponding to the inner surface of the groove; and', 'a rotating part disposed at one of the two ends of the tilting portion, being pivotally connected to the pivotal end of the fixing portion, and having'}, 'a forced part connected to the rotating part., 'a tilting portion pivotally connected to the fixing portion and having'}], 'multiple blade assemblies mounted radially on the outer surface of the transmission seat at equi-angular intervals, and each one of the blade ...

GREEN POWER GENERATION SYSTEM AND METHOD

The present disclosure first uses a pumping device to retrieve water using an internal power source from a water source. Then, in accordance with a wind parameter and a solar parameter, wind-powered and solar-powered pumping devices are selectively engaged to replace the pumping device. The water is stored in the water storage device in a higher place. As the water runs through an inlet pipe, it is pressurized to drive a first hydraulic generation device. Then the water's potential energy is used to drive a second hydraulic generation device as the water is recycled to the water source. The produced electricity is delivered to the pumping device and, if any remaining, then to a light device for illumination. 1. A green power generation system , comprising:a pumping device for retrieving water from a water source;a wind-powered pumping device electrically connected to the pumping device, which is actuated when a wind parameter reaches a threshold and replaces the operation of the pumping device;a solar-powered pumping device electrically connected to the pumping device, which is actuated when a solar parameter reaches a threshold and replaces the operation of the pumping device,a water storage device disposed above the pumping device and connected to the pumping device, the wind-powered pumping device, and the solar-powered pumping device, where the water storage device comprises a container, an inlet pipe whose two ends connect the pumping device and the container, respectively, and an outlet pipe whose two ends connect the container and the water source, respectively;a first hydraulic generation device configured above the container and engaged by the water delivered by the inlet pipe;a second hydraulic generation device configured along the outlet pipe driven by the water in the container's potential energy; anda lighting device electrically connected to the wind-powered pumping device, the solar-powered pumping device, the first hydraulic generation device, and ...

Hydropower System

A hydropower system has a channel and at least one water turbine. The channel has a flowing path, two side walls, and at least one turbine recess recessed in at least one of the side walls and having an opening communicating with the flowing path. The at least one water turbine is mounted in the at least one turbine recess and has a shaft, a blade wheel, and a generator. The blade wheel is mounted on and rotatable with the shaft and partially protrudes into the flowing path. The generator is connected to the shaft. The blade wheel may be propelled to rotate by flowing water flowing through the flowing path to drive the generator to generate power. 1. (canceled)2. (canceled)3. (canceled)4. A hydropower system comprising: two side walls;', 'a flowing path formed between the two side walls; and', 'at least one turbine recess recessed in at least one of the side walls of the channel, and each one of the at least one turbine recess having a spinning space formed in the turbine recess and an opening communicating with the flowing path;, 'a channel having'} a shaft vertically and axially rotatably mounted in the spinning space of the corresponding one of the at least one turbine recess;', a base fixed on the shaft; and', 'multiple driving blades mounted around the base at equiangular intervals and extending radially; and, 'a blade wheel mounted on and rotated with the shaft, partially protruding into the flowing path of the channel from the opening of the corresponding one of the at least one turbine recess, and having'}], 'at least one water turbine, an amount of the at least one water turbine being equal to an amount of the at least one turbine recess, and each one of the at least one water turbine mounted in the spinning space of a corresponding one of the at least one turbine recess, and having'}a generator connected with the shaft wherein a fixed arm fixed on the base and extending outward from the base; and', 'a swing blade pivotally connected with the fixed arm in a ...

GREEN CULTIVATED POOL STRUCTURE

Disclosed is a green cultivated pool structure. The water in the reservoir of the cultivated pool flows naturally from the high-bottom water storage portion toward the low-bottom water storage portion, and the water in the drainage trough flows naturally from the first drainage portion toward the second drainage portion, thereby achieving the natural circulation and green environmental protection. 1. A green cultivated pool structure , comprising:a water reservoir, at least one inclined angle being formed on a bottom face thereof, said inclined angle defining at least one high-bottom water storage portion and at least one low-bottom water storage portion on said reservoir;a first drainage portion, defined on a side wall face of said reservoir and adjacent to said low-bottom water storage portion;a second drainage portion, defined on a side wall face of said reservoir and adjacent to said high-bottom water storage portion;a drainage trough, defined on one side of said reservoir, two ends of said drainage trough being respectively in flow communication with said first drainage portion and second drainage portion, and a height of a bottom face of said drainage trough being decreased gradually from said first drainage portion toward said second drainage portion.2. The structure according to claim 1 , wherein a cultivation portion allowing water animals' activities is extended from one end of said second drainage portion of said drainage trough.3. The structure according to claim 2 , wherein said cultivation portion is configured with an oxygen supplying device for the provision of oxygen in said water claim 2 , a temperature controlling device adapted to control water temperature and a filter device adapted to filter water impurities.4. The structure according to claim 1 , wherein a support device adapted for the provision of water nutrient is configured on said reservoir.5. The structure according to claim 1 , wherein at least one water power generation device is ...

Improved structure of slant-standing-type device for massaging the circulation system of a human body

Wind-power and hydraulic generator apparatus

A wind-power and hydraulic generator apparatus has a wind power device, a drive device, multiple pump devices, a reservoir device and a hydraulic device. When the wind blows, the wind power device generates and stores electricity and the drive device drives the pump devices to pump water into the reservoir device. Then the reservoir device generates a water jet enabling the hydraulic device to generate electricity. When the wind does not blow, the electricity stored in the wind power device still enables the water to circulate and to generate the water jet. Whether the wind blows or not, the water of the reservoir device can keep circulating to generate the water jet and the hydraulic device can keep generating electricity. Accordingly, the wind-power and hydraulic generator apparatus can use wind power to generate a water jet.

Drive blade group

本新型提供一種驅動扇葉組，其設有一傳動裝置及複數片扇葉，其中該傳動裝置設於該驅動扇葉組之中心處，且該傳動裝置設有一傳動座，該複數片扇葉沿該傳動座的徑向方向間隔設置於該傳動座之側壁面，各扇葉設有一固定部及一轉動部，各扇葉的該固定部具有一樞轉端及一限位槽，該限位槽朝內凹設於該固定部鄰近該樞轉端之側壁面，各扇葉的該轉動部與該固定部相樞設連接，藉以透過該固定部的樞轉端為軸心相對該固定部轉動，該轉動部設有一樞轉部及一受力部，該樞轉部設有一與該限位槽之內壁面相對應之抵靠面，使該樞轉部容設於該限位槽之中時，該限位槽會對該樞轉部造成一限位效果，藉以提供一能提升輸出扭力，進而提高電能轉換效率的驅動扇葉組。

Exhaust purification system

An exhaust purification system has a centrifuge filter, a first fan device, a second fan device, a pump, and an ozone generator. The centrifuge filter has a container having a waste gas treating area and a wastewater treating area. The first fan device communicates with and draws gas into the waste gas treating area. The second fan device communicates with and draws the gas out of the waste gas treating area. The pump communicates with and draws wastewater from the wastewater treating area. The ozone generator communicates with the pump and introduces ozone into the wastewater inside the pump. A part of the ozone dissolved in the wastewater is released to the waste gas treating area to react with the gas, and the other part of the ozone dissolved in the wastewater reacts with the wastewater.

具有雙層夾模效果的鞋面定型機

本新型係一種具有雙層夾模效果的鞋面定型機，係包括一機體、至少一雙層熱模夾具組以及至少一冷模模具組，該至少一雙層熱模夾具組係設有一第一夾具裝置、一連接架以及一第二夾具裝置，其中該第二夾具裝置係透過該連接架設置於高於該第一夾具裝置的位置，透過將兩夾具裝置係垂直重疊連接，不僅減少現有鞋面定型機在該機體的兩外側分別掛設一熱模夾具組的寬度，有效節省空間，更能避免凸出於該機體外側造成人員碰撞的問題，藉以提供一種具有雙層夾模效果的鞋面定型機。

Soil and water quality improvement method

A soil and water quality improvement method includes the following steps. An electrode element is disposed into a tubular body and he tubular body includes a plurality of through holes formed therein. The tubular body is then buried in a growing medium to be improved. Afterwards, ozone water is introduced into the tubular body and the ozone water is spread through the through holes into the growing medium to carry out an operation of sterilizing, and then electricity is conducted into the electrode element to carry out electrolysis. After the operations, an inspecting element is used to inspect the growing medium. Finally, the nutrition additive is conducted into the growing medium through the tubular body to complete the improvement of the growing medium, allowing a contaminated growing medium to be reused for cultivation.

Vacuum extraction freeze drying machine

Crisscross-shaped device for measuring human spine

Energy storage and generation device

An energy storage and generation device has a motor, at least one renewable energy generator, a generator configured to be driven by the motor, a first storage unit, and a second storage unit. The first storage unit is for storing electrical energy generated by the generator, and the second storage unit is electrically connected between the at least one renewable energy generator and the motor.

充氣式後踵定型模具

Vacuum extraction refrigeration dryer

Vacuum concentrated dewatering apparatus and method thereof

Multilayer-type fan device

A multilayer-type fan device has a base, a major blade group and at least one minor blade group. The base is circular and has a top, a bottom, an external surface, an axle hole and at least one inclined plane. The external surface is formed around the base at the bottom of the base. The axle hole is formed through the base from the top to the bottom of the base. The at least one inclined plane is formed on the base between the external surface and the top of the base. The major blade group is mounted on the base and has multiple blades mounted on the external surface of the base at intervals. The at least one minor blade group is mounted on the base and has multiple blades mounted on one of the at least one inclined plane of the base.

具可拆換之膠套的後踵定型模具組

可控制膠模局部溫度的鞋具定型機加熱膠模組

Shoe head shape-forming machine

真空濃縮脫水設備

真空濃縮脫水設備及其方法

本發明為有關一種真空濃縮脫水設備及其方法，主要乃將參雜有固態體的液體受第一抽真空裝置的吸引經由第一過濾進料通道至第一過濾裝置內，此時固態體受第一過濾裝置的過濾阻擋，而液體持續經過第一過濾出料通道及第一真空進料通道而被輸送至第一真空淨化裝置內，爾後當第一抽真空裝置抽真空至一臨界值時第一閥體關閉，且第一抽真空裝置停止真空吸取，並改為吹氣模式，使第一真空淨化裝置內的液體進行釋放，並由第一排放通道排出；此後再由第二抽真空裝置進行抽真空作業，作動如上以此類推，藉此透過輪流作動的方式以達到增快分離速度之優勢。

具可擺動之工作臺的鞋面定型機

充氣式後踵定型模具

全罩式氣壓鞋材成型模

Device for separating dry solid and liquid by cooling spray

A device for separating dry solid and liquid by cooling spray has a material reservoir which can adjust and control low temperature for preserving material, a high-pressure pump for extracting material to high-pressure sprayer. Besides, material is pressurized to become a spray state for spraying by adjusting a nozzle of the high-pressure sprayer, and then dry air having high temperature can form a circulating cycle in the steel tub via a heat exchanger of a gas-drying machine to make water content of a spray of liquid be absorbed by dry air having high temperature such that original material becomes powder solid. Besides, air inside the steel tub absorbs much water content due to heat exchange, and then the air with much water content and high temperature is cooled via the heat exchanger when passing through an air filter. After water content of the air is condensed, the air is reheated for using in next cycle.

鞋面蒸濕熱模夾具組

Sewage filtering and purifying device

A sewage filtering and purifying device has at least one purifying module having multiple filters and multiple electrolyzing assemblies connected in series. Each electrolyzing assembly has a flow pipe and two electrodes disposed inside the flow pipe. The two electrodes are configured to be polarized for respectively being a cathode and an anode. When treated by the sewage filtering and purifying device, sewage first flows through and is filtered by the multiple filters; then the sewage flows through and is electrolyzed by the multiple electrolyzing assemblies. Since the sewage is filtered by the multiple filters first, the sewage can be electrolyzed better in the multiple electrolyzing assemblies, and harmful substances in the sewage can be oxidized or reduced and transformed to harmless substances. Thereby, the sewage is purified better.

Toe-cap molding machine

A toe-cap molding machine has a body, a clamping device and a shoe-tree mount. The body has a base panel, a connecting mount, a clamping cylinder and a shoe-tree cylinder. The clamping device is detachably connected to the body and has two quick-release groups and a mold group. The quick-release groups are securely mounted on the assembling panel, and each has a quick-release mount, a clamping mount and a first spring. The quick-release mount has a releasing hole, a holding pin and a mounting recess. The clamping mount is pressably connected to the quick-release mount and has an engaging block, an elongated hole and an engaging head. The mold group is connected to the quick-release groups and the assembling panel and has two guiding shaft, a limiting panel, two second springs and a clamping mold. The shoe-tree mount is detachably connected to the shoe-tree cylinder below the clamping device.