... reduce health rick sector, timely adopt intervene method, eliminate body uncomfortable2) The TENS muscle stimulator will improve sub-health ... state of physical discomfort, eliminate fatigue, and relax body and mind, improve sleep quality3) The TENS muscle ... : Frequency range: 1kHz—2kHzImpulse width: 0.1ms—1ms Product accessories: Charge, USB line, Battery cover, Lithium battery, Energy ...