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 neck pillow are sustainable heating and improve the blood circulation to Relieve tired. 4.   Neck pillow can water resistant. 5.  External battery system is safe. 5.  Customer tailored design and development service is available.