Tens Unit Machine Device 24 Massage Modes Newest Model Muscle Stimulator for Lower Back Neck Shoulder Pain Relief Massager Comes with 10 Pads [5 Pairs] Complete Set Belt+ShoeFEATURES : Multiple preprogrammed massage modes. Adjustable 20 to 60 minutes timer by using " T " button. Rechargeable internal lithium battery. Up to 20 hours continues use. A B Output will allow you to use it as 2 separate users. TENS EMS Combo: You can use either Tens modes or EMS modes or you can use the combination of TENS and EMS modes. Multi modes offer variety of stimulation of popular massages such as kneading, Tai chai, Swedish, Cupping,