... size, greater capacity, more environmentally feather, can be reusable for 500 times.Using Ceramic heating element to save energy, get ... you like.- Using instruction:There are three buttons, 0 for OFF, .for low temperature, .for high temperature.When the warmer is ON, then the ... near high-temperature heaters such as electric blankets, stoves and so on. hot pack pad electric USB li-battery hand warmer CE ...