Pain Relief Machine: The rechargeable electric muscle massager can stimulate the sensory nerves and muscles, activate specific natural pain gate mechanisms, relax your body and have pain management anytime you feel the needUp to 20 Modes: Pre-set modes offer you hammering, kneading, shiatsu, and more choices to help relieve pain associated with aching and fatigued muscles in the shoulder, lower back, and knee from exercise, normal household or work activitiesIndependent Mode Control: 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 stimulatorIndustry-leading TENS Pads: The included electrode pads can provide excellent self-stick performance for up to 45 uses. The shaped 2" 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 reliefWhat You Receive: 1 x Dual Channel TENS Machine, 4 x 2" Square Electrode Pads, 4 x Large Rectangle 2"x4" Pads, 2 x Lead Wires, 1 x USB Cable, 1 x USB Charger,1 x User Manual, 1 x Pad Holder, 1 x Pouch, our 24-month warranty and technical support and friendly customer service (4pcs 2x2 pads are in a pack while 2pcs 2x4 pads are in a pack. Please open the sealed bag firstly and unfold each pads pack before counting the pads quantity.)