1.Powered by rechargebale Li-ion with charger 2.Electrical heating Vest use carbaon fibre heating 3.three pcs heating pads electronic battery heat pad vest1.Powered by lithium battery with charger. 2.Heat pad vest uses carbon-fiber as the heating materials, offering you the most comfortable temperature, Keep warm in cold winter. During the heating process, carbon-fiber will generate far IR, which ...