* May be used as an outer glove or glove liner * Micro-thin stretchable carbon fibers * No external wires * 3 temperature levels * No interfering cable * Warms hands for up to 5 hours * Batteries can be recharged up to 500 times * Includes 2 x large capacity 3350 mAh rechargeable Li-ion Polymer batteries and USB charging cable. Note- replacement batteries available This winter, you should do your hands a favor. Even on the coldest days, keep your hands warm with our ThermoGloves, the first wireless and rechargeable heated gloves worldwide. ThermoGloves are a thin glove liner that you can wear on their own, or slip under your favorite pair of outdoor gloves when it gets too cold.