... Two heating modes and high efficient conversion; 2.USB device protection; 3.Eco-friendly,simple to operate, ... content is as more as 90%.When USB Warm Pad is energized,the carbon material will ... possible (conversion rate is about 98%). Furthermore,USB Warm Pad has good endurance ability against high ... .3. Power supply: connect with computer through USB, low-voltage ,safe and convenient.4.Usage: ...