SUNMAS Sm9178 Body Electronic Muscle Stimulator Mini TENS Therapy Unit Back Neck Leg Pain Relief Massager (Black) Builds and tones muscle, relieves injury and general pain and gives relaxing massage Consumed current:40mA Status adjustment:6 kinds of status Strength level adjustment:20 sections Timer:With 10-60 minutes stop timer Function:Simulation therapy by acupuncture, Massage by electronic knock etc. Relieve Pain, Stimulate & Exercise Muscles, Increase Blood Flow