A portable lock

A portable lock comprising an elongate member 2, a housing 1arranged in use to receive the first and second ends of the elongate member and a lock mechanism to lock said ends in a locked position; wherein in said locked position said ends are attached to said housing to form a mechanical and electrical circuit, and a key arranged in use to detach at least one end of said elongate member from said housing to open the circuit. Preferably an alarm sounds if the elongate member (e.g. chain etc.) is cut, the lock may also include global systems for communication GSM technology to send a text message SMS if the alarm is triggered. The housing may have an LCD screen 6 for displaying information regarding the lock or device status, a pvc cover may be placed over the screen. A test button may be provided to test the operation of the lock.