1.Powered by rechargebale Li-ion with charger 2.Electrical heating Vest use carbaon fibre heating 3.three pcs heating pads electrical infrared warm heated red vest 1.Powered by lithium battery with charger. 2.Heat 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, ...