Details Your health. Our technology. Temporarily treats muscle pain. 20 levels. 6 modes. Rechargeable battery included (Voltage: 3.7V, 180mAh). Our at-home and on-the go TENS Therapy Device is perfect for temporary relief of muscle aches and pains in your back, shoulders, arms, hips, and legs. Relaxing electrical currents temporarily treat muscle pain and improve muscular performance. Pain Relief: Electrodes deliver electrical current to the skin to temporarily treat muscle pain. 20 Levels / 6 Modes: Finely-tuned intensity, frequency and duration of electric pulses. Wireless: Wireless design for maximum convenience while in use. USB Rechargeable: Integrated USB rechargeable lithium ion battery. Compact, lightweight and wireless. Target specific muscles throughout your body including back, legs & arms. Find our full line of compression and pain relief solutions. Back pain. Arm pain. Leg pain. Shoulder pain