The low voltage powered model is designed for operation on a 3 to 5V DC supply capable of providing in a current of 1.5 amps. Power input is via a pair of colour coded 4mm sockets. Mains operated versions are provided with 1.5 meters of 3 core mains cable. The earth core of the mains leads being connected to the metal structure of the apparatus. Both voltage & mains versions also have independent 4mm earth sockets with discharger of 75mm dia with handle.