"A slip ring is an electromechanical device that allows the transmission of power and electrical signals from a stationary to a rotating structure. A slip ring can be used in any electromechanical system that requires rotation while transmitting power or signals. Slip ring can improve mechanical performance, simplify system operation and eliminate damage-prone wires dangling from movable joints. Use while length at a premium but diameter less restrictive Low noise Wear-resisting Signal and current compatible Most reliable in Asia market http://www.btslipring.com"