... feather, can be reusable for 500 times.Using Ceramic heating element to save energy, get higher temperature and ... , .for low temperature, .for high temperature.When the warmer is ON, then the LED indicator turns red, at ... a dry place.During use and storage, if the warmer appear abnormal phenomena such as smelly, hot, discoloration, ... . hot pack pad electric USB li-battery hand warmer CE & ROHS approved