Digital TENS, with Electrodes and Carry Case, Rx Required (GF-TX5) T.E.N.S. (Transcutaneous Electrical Nerve Stimulation) is indicated under a physician's prescription for the symptomatic relief and management of chronic (long-term) pain and the treatment of post-operative or post-traumatic pain. Features: Dual Channel, Timer, LCD ScreenModes: 3 - Standard, Burst, ModulationIncludes: TENS Unit, soft carry case, instructions, four electrodes and lead wiresUses: 9 Volt Battery (not included) Standard Features: Dual channels LCD indicating operation modes and output Three modes: Standard, Burst, Modulation Includes: TENS unit, soft carrying case, instructions and accessories (four electrodes and lead wires) Also required (not included): One 9-Volt alkaline battery Federal Law (USA) restricts this device to sale by or on the order of a physician.