R-C1-K01 is a rehabilitation physical therapy device suitable for OTC The R-C1-K01 is powered by a lithium battery and uses the USB interface to charge, no need to replace the battery. R-C1-K01 is used to relieve pain, stimulate muscles, and relax muscles. HOW IT WORKS:The TENS unit sends comfortable stim impulses through the skin that stimulates the nerve in the treatment area, acting as an electric massager, and calming the nerve. Treatment can be given on demand or via timed therapy sessions up to 90 minutes. In many cases, this stimulation will deliver immediate pain relief. Pain relief varies by individual and by the type of pain you are in. The R-C1-K01 comes complete with: The TENS 7000 TENS Unit Two(2) pair of lead wires Two(2) pack of reusable TENS unit pads(electrodes) One(1) pcs of USB charging cable. One(1) pcs of Quick start guide One(1) pcs of instruction manual The TENS device is equipped with 10 powerful TENS treatment modes, 8 muscle stimulation modes and 5 massage modes. Control the intensity of the TENS device with two +/- keys, allowing you to control Stimulation power of dual channel pulse. M key to select TENS / EMS / MASS mode. The P key changes the part used, the T key changes the time used, and the S key quickly selects the part used. The recommended replacement electrode is the ROOVJOY brand.