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