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Penetrating Deeply Tens Unit Electronic Stimulator With Six Traditional Chinese Medicine Product Features: 1,Strength adjustment: turn clockwise to turn on the unit, and enhance the strength; turn counterclockwise, the strength is reduced gradually until power off. 2,Strenghth display window. 3,Output jack. 4,six independent function keys: when press one function key, the indicator will be on. 5,2000 key: when press this key, the function will deep penetrate into the skin. 6