Material: PU, ABSBattery: 3.7V, 220mAh batteryWorking voltage: DC 3.3VCharging voltage: DC 5VAbdominal Patch: about 650 * 170mm / 25.6 * 6.7inArm Patch: about 190 * 60mm / 7.5 * 2.4inCharging method: 3-in1 USB cableWorking modes:6 massage methods and 10 strengths modes 1Self-training: You can train your muscles in the office, in the bedroom or wherever you want, not just at the gym. 2Can be adjusted:With six different massage methods and ten strengths modes can be adjusted to suit different needs. 3Low frequency therapy: It help muscles increase flexibility, fullness and better fitness. 4Ergonomic design: The soft design of the patch fits perfectly with the skin, the pad is odorless and does not harm the skin. 5Easy to use: Just stick it to your body every day, then you can easily achieve your workout goals, convenient and practical.