Size:17*8cm 1. Simple, Heat palms and backs of hands on both sides . 5V voltage, safe and comfortable, promote blood. 2 This product adopts high-tech heating material and USB 5V low voltage, which is environment-friendly, energy-saving, safe and reliable. 3. The product is soft, comfortable and free to move. Just open the inside of the glove and take out the internal heating element, that is, the glove is very light and can be cleaned. 4 It can reach a very comfortable and warm temperature of about 42 in a short time. Beautiful design, suitable for winter use and gift giving. 5. Applicable scenarios: cycling, sports trend, fitness equipment, running and outdoor travel. Cold hands in winter will affect your work efficiency and your ability to deal with daily work and housework. Our hand warmer not only provides you with warm and comfortable cloth to warm your hands. It can also be heated against and against extremely cold temperatures, allowing you to function and prevent your hands from freezing.