1.  5V USB battery electric heated, one button control, low temperature battery is optional . 2.  Three temperature settings, Red 53°C/127°F, Blue 45°C/113°F, Green 35°C/95°F 3.  by the frared ray the waistband is sustainable heating and able work in -40°C. 4.  Gloves can water resistant. The washable are up to 40 time. 5.  External battery system is safety. 6.  Customer tailered design and development service is available.