... power, 5 voltages, power, 2.5W2,*High efficiency, when the environment temperature is 5°C--10°C,this foot warmer can warm ... to human, the highest temperature is 50°C, the temperature range is 40-50°C.3*Convenient, soft, easy to operate ... the requirements and do OEM6,. More shape and color avaliable High Quality Heating Slippers USB Warm Shoes