Due to State and Federal Law, we sell Syringes and Needles only to the Medical Facilities. Dual Channel * Unit comes complete with: set of 2 wires, pack of 4 silver/silver chloride self sticking electrodes, 9V alkaline battery, ac adaptor, instruction book and attractive carry case * Dual channel - quadra polar * Adjustable pulse amplitude * Carrier frequency plus interference frequency * Sweep and treatment timers * Shipping Carton Size: 12"L x 10"W x 6"H