Description:【Built-in Heating Sheet】Wearable Heating Pad with a built-in heating sheet can help relieve waist muscle tension, abdominal discomfort, and dysmenorrhea by heating. heats up faster in seconds. The electric heat pad for the waist is designed to provide hyperthermia to relieve tension of the waist muscles, abdominal discomfort, menstrual discomfort and stomach discomfort.【Selected Material】Selecting crystal super soft fluffy cloth, Heating Pads for Cramps have soft, comfortable, skin-friendly, and durable enough characteristics.【USB Charging】Electric Heating Pad adopts USB charging. You only need to connect it to a 5V low-voltage power source, such as a power bank, computer, car charger, or other power source with a USB output interface.