Description NOTE: Kindly refer User Manual and Guide before use. The pulse amplitude, or intensity level, is adjustable from 0-100mA in 10mA increments, which is controlled by the respective knobs located at the top of the device, for both channels. Use electrode in pairs, when used with 1 electrode, the device will not work. Treatment is timed with the device, and the device will automatically shut off after a certain time period within setup. Feature: A TENS unit muscle stimulator and electric massager that provides pain relief, acts as a muscle massager or shoulder massager, provides carpal tunnel relief, and acts as a muscle relaxer(great for muscle recovery) GET IMMEDIATE PAIN RELIEF: TENS machine comes with multiple TENS therapy modes that will provide instant muscle pain relief. An electrotherapy machine with everything needed for TENS therapy, a class leader in electric massagers for muscles. The pulse amplitude, or intensity level, is adjustable from 0-100mA in 10mA increments, which is controlled by the respective knobs located at the top of the device, for both channels DUAL CHANNEL TENS UNIT: The TENS TENS unit provides TENS therapy and is a muscle stimulator, nerve stimulator, and electric massager with independent dual channels that control four(4) TENS unit pads (electrodes) for targeted pain relief