1.  5V USB battery electric heated, one button control, low temperature battery is optional . 2.  Three temperature settings, Red 52°C/127°F, Blue 45°C/113°F, Green 35°C/95°F 3.  By the frared ray, the waistband is sustainable heating and improves the blood circulation to relieve sore. 4.   waistband can water resistant. 5. External battery system is safety. 6. Customer tailered design and development service is available.