We have designed the low voltage powered models of our collection so that these can operate on a 3 to 5 VB D.C supply capable for providing of current of 1.5 A. The power is supplied through a pair of coloured coded of 4mm sockets. With 1.5m of three core mains cable, the main operated version is provided. The earth core of the mains lead is connected to the metal structure of the apparatus. Both the main versions and voltage also have 4mm earth sockets with discharger having diameter of 75mm with handle.