DonJoy® Hip Abduction Pillow, 1 Each Syringes Ear push button adjustment allows for push Walkers Specialty Accessori push button adjustment allows for push pins to be depressed without pinching fingers Dual Channel * 4000 mHz * 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 * HCPCS Suggested Code: E0730 * Interferential stimulators use a fixed carrier frequency of 4 000 Hz per second and also a second adjustable frequency of 4 001 4 400 Hz per second * When the fixed and adjustable frequencies combine (heterodyne) they produce the desired signal frequency (Interference frequency) Height: 3 inches 4 inch tear off block on both ends of pillow for adjustment from 19 to 27 inches in length