1. Use computer USB to supply power, 5V voltage, safe and reliable; it would not do harm to human body. Connect shoes USB plug with computer USB, turn on the control of shoes, they will become warm in short minutes2. One USB slippers have no electric control, the heating part can move from the USB shoes3. 5 minutes for 10癈 rise4. Can be cleaned with water but with no danger5. The USB slippers directly use computer USB power, or use transformer to connect with 220V or 110V power (transformer need to be bought)Packing:Polyester bag
producing area:China