Are you disturbed by the aching of neck and shoulder due to the long seating working? Are you soared of muscles due to high-intensity sport? Are you still fighting with insomnia? If yes, our tens unit machine impulse massager can help to reduce your pain and relax your body. Featured with 16 working modes,20-level intensity, A/B outputs and 2 electrode wires(with 2 wire connectors per electrode wire), our muscle tens can work up to 6 hours and only 2 hours fully be charged, you can share with yo