Pain Relief Machine. The rechargeable electric muscle massager can stimulate the sensory nerves and muscles, activate specific natural pain gate mechanism, relax your body and have pain management anytime you feel the need. Independent A/B Channel with 20 Modes & 20 Intensities. You can set separate modes and intensities for channel A and channel B. For example, you could choose Acupuncture mode in channel A with an intensity level of 5 for your shoulder. While 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. 20h of Battery Life. No worries about usage interruption for dead AAA batteries anymore! The built-in rechargeable lithium battery supports 20h of continuous use and can be charged anytime with a wall charger, power bank or laptop port. 24pcs Industry-Leading TENS Pads. The included electrode pads can provide excellent self-stick performance for up to 45 uses. The 16pcs 2"x2" TENS electrodes are recommended for more compact pain areas like the knees or elbows. Meanwhile, the bigger 2"x4" reusable patches are perfect for larger areas such as the back for TENS pain relief. What You Receive: 1 x Dual Channel TENS Machine, 16 x Square 2" Electrode Pads, 8 x Rectangle 2"x4" Pads, 2 x Lead Wires, 1 x USB cable, 1 x Adapter, 1 x User Manual, 1 x Pad Holder, 1 x Belt Clip, 1 x Pouch