... .for low temperature, .for high temperature.When the warmer is ON, then the LED indicator turns red, at ... off the power, and then you can use the warmer again.- Warm reminders:When the power is low , ... a dry place.During use and storage, if the warmer appear abnormal phenomena such as smelly, hot, discoloration ... , stoves and so on. hot pack pad electric USB li-battery hand warmer CE & ROHS approved