Devon™ Surgical Skin Marker, 1 Box of 25 Shoulder Immobilizers Supports Dual Channel * 4000 mHz The wetness indicator turns 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) Level Left Arm * Shoulder elbow wrist hand orthosis for stable arm support * Especially effective for contracted arm residents * Adjustable angle capability to adapt to resident s specific needs * Removable arm trough of comfortable high density foam * Easily installs to any half arm or full arm wheelchair * Available in level or elevated arm model which provides full hand extension * Covered in durable wipe clean nylon * Please specify left or right arm * non smearing non irritating gentian violet inch