USB Heating Rod Led Heater Warmer Pad Stick AUTO 38℃ Control Indicator Description: Automatic Temperature Control under 38℃ Material: ABS,PU Size: 16 x 2 cm Cable length :90cm Feature: Fast to raise the temperature,4 minutes to be heat. Fit for body temperature. 100% waterproof. Automatic temperature control and heat preservation function: The built-in temperature sensor automatically stops heating when heated to the true body temperature, and automatically turns on the heating function when it is lower than the body temperature, similar to the air conditioning system. LED Flash remind when the heater is charging . USB Charging head, low voltage, very safe and convenient. Package included: 1 *  LED Heating Rod