Perfect Winter Gift for Family, Friends, Coworkers. New Updated Heated Vest: The heated vest works as a personal radiator to keep your body warm anytime. As one of heat therapy, the vest can promote healthy blood flow that increases the oxygen and nutrient flow to muscles, relieving pain, decreasing recovering time and improving overall performance. 3 Heating Level: Triple-switch design Should, Waist & Abdomen switch can be operated separately, 3 heating level from 35 to 55. Customers can choose how to heat the heating pads according to your own demands. Safety Assurance: Built-in thermal protection module. Once it is overheat, it would stop until the heat return to the standard temperature, so it is 100% safe to use. Work with common power bank with common USB port, you can choose High-storage power bank or prepare multiple batteries in advance. (Power bank is not included)