... .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 ... dry place.During use and storage, if the warmer appear abnormal phenomena such as smelly, hot, discoloration ... blankets, stoves and so on. hand pads USB hand warmer hand heater hand pack with 1800mA lithium battery ...