3.Quality is reliable
4.Comfortable hand feeling
Take 8-14minutes to heat up only, which can keep warming hand for 2 hours and warming quilt for 6 hours. When temperature reaches 65-78degree, the power will cut automatically to prevent to heating.Explosion proof. In case of the thermostat broken, the other expansion controller will begin to operate. Avirulent water ,infuse one time, can be used forever.