These points are the core part of every self-heating waist protection. Without these points, its function will be greatly reduced. These "dots" are composed of a variety of heat-sensitive materials, such as tourmaline, of which tourmaline is a natural mineral, which China people used to call tourmaline, that is, "charged stone". It is the only crystal with thermoelectric and piezoelectric effects in nature. When the external environment changes slightly, such as slight magnetic field change, slight friction, slight pressure and slight humidity change, a large number of far-infrared negative ions and bioelectricity will be released immediately. By transferring the catalyst, heat-sensitive substances can be driven to play a role, which can promote local blood circulation, stimulate human acupuncture points and promote the discharge of human toxins, so that the human body will feel fever and acupuncture.