[Upgrade 36 Modes]: Multifunctional Tens Massager with 36 Preprogrammed Massage Modes for Pain and Muscle Relief. TENS Unit help relieve pain associated with sore and aching muscles in the shoulder, waist, back, neck, upper extremities (arm), and lower extremities(leg) due to strain from exercise or normal household work activities. [Non Invasive, Non Choice for Relieving Pain]: Great Device You Can Use for Pain Management. If you want to relieve pain, just trying TENS massager. Massagers delivers low-voltage pulses to the skin to stimulate fibers effectively blocking the pain signal to your brain. Also increases natural endorphins--a natural pain reliever. [Dual Channel Control]: A/B Dual Channels Tens with 36 Modes, 20 Levels Intensity and Time Control. You can operate it with different intensity settings. For example, you could choose Acupuncture mode in channel A with an intensity level of 5 for your shoulder. In channel B, the Tapping mode is being run with the intensity set to level 12 on your lower back as a back electric stimulator. Relax Any Time Anywhere with Pocket Size! Make this the most powerful weapon for your body relax. [Built in Powerful Rechargeable Battery]: Up to 20 Hours of Continuous Use. It can be connected to wall charger, power bank or laptop USB port to charge. Color: Black Material: ABS Package Contents: 1x Tens Unit Muscle Stimulator 10x Pads 1x Storage bag 1x USB Cable 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.