Electrotherapy Stim Machine... Drug-free pain relief with no side effects, TENS machines are physical therapy equipment that can help reduce & relieve muscle & joint pain without the side effects associated with medications. Immediate muscle pain relief.TENS Therapy is a drug-free pain relief electric shock therapy for muscles often used as a muscle stimulator for chronic pain management, muscle pain or to aid the healing process of injuries. Electrical impulses stimulate the nerves to reduce pain.Tens Electric Massager with 6 Modes, 19 Levels Intensity for Pain and Muscle Relief. TENS unit help relieve pain associated with sore and aching muscles in the shoulder, waist, back, neck, upper / lower extremities(arm/leg) due to strain from exercise, overwork or normal household work activities. Activate specific natural pain gate mechanism, relax your body anytime you feel the need with our professional grade TENS electrotherapy pulse massager and accessories.Our TENS Unit Replacement Patches has been upgraded to the industry leading adhesive, which can provide much better self-stick performance and easy clean up for longer lifespan. It quite easy to find compatible electrodes (2mm pigtail tens unit pads) on the market for you to choose fromPackage includes a USB cable (No Adapter) that can be connected to a wall charger, power bank or laptop USB port to charge. One charge provides 40 hours of useage, which is more environmentally friendly than AA batteries and lasts longer than other machines.Colour:BlackMaterial:ABSPackage Contents:1 x EMS Massager (Dual Control 1 For 4)Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.