Okay. Mingxin Jiajianuan is a very good graphene electric heating board among China's patented high-end brands. Far-infrared heating has a physical therapy effect on waist and leg pain. It is environmentally friendly, safe and has no radiation. It can be used by the elderly, children and pregnant women with peace of mind. The after-sales warranty is five years. No hot replacement is required, professional technicians will come to install it free of charge.