DetailsDescription & Features 4 Channel with 8 TENS Pads - Equipped with 4 output channels(CH1-CH4) and 8 electrode pads, this rechargeable muscle stimulator allows for simultaneous treatment of multiple muscle groups, such as back, shoulders, legs, arms etc.. Relieve chronic and acute pain, such as sciatica, joint pain, back pain, leg pain, menstrual pain, menstrual cramp pain and more.48 Massage Modes & 4 Programs - This TENS unit provides 48 massage modes and 4 specialized programs - TENS (16