Pressure sensitive electrical switch device

A membrane switch comprises an electrically insulating base 2 having at least one region comprising a plurality of spaced electrically conductive elements 3 alternately connected to opposed terminals and an electrically insulating layer 4 having electrically conductive particles distributed therethrough laid over and in contact with the elements 3 for bridging at least two adjacent elements 3 when pressure is applied between the layer 4 and conductive elements 3. The switch includes a waterproof layer 5 and an upper overlay 6 having symbols marked thereon. The switch is designed such that no significant "dead" or non- sensitive areas exist, thereby enabling the switch to be used especially by small children or mentally or physically handicapped persons. ...