Output of 2 channels, which can be used to treat various parts of the body simultaneously.  You can choose any of the treatment modes shoulder/waist/joint button/foot.  Specially designed to lessen pain in muscle.  Large LCD display for easy readaout.  Stimulate muscle by a simple relaxing electronic impulse.  Improve blood circulation.  Gradual release muscle pain.  Compact size, can be used anywhere and anytime.  Safe and convenient, quick and quiet.  Provides a really simple way to relieve pain in shoulders, back, waist and other parts of the body.  Specifications: Voltage: DC 3V  Rated Working Time: 30mins  Power Supply: 3 x1.5V AAA Battery(not included)/  AC Power through USB Interface(included) Color: As the pictures show  Material: ABS  Item Size: 15 * 10 * 5cm Item Weight: 217g  Package Size: 30 * 26 * 7cm Package Weight: 738g   Package List: 1 * Monitor  4 * Sticker Pads  1 * Two Electrode Cable  1 * Four Electrode Cable  2 * Slippers  1 * USB Interface  1 *  Plug