It is best for car owners to choose products with fast heating speed and uniform heating area. "Some heating pads now have slow heating speeds, and some have different heating positions in different gear positions, which will affect the heating effect." Buy low-quality heating pads cheaply. External heating pads are often directly installed on the cigarette lighter. Adding a heating pad to the cigarette lighter is especially easy to burn the fuse; additional electrical appliances may affect the original circuit due to different power. It will cause short circuit of wires, destroy electrical equipment, or cause fire.
In addition, according to the "Special requirements for electric blankets, electric heating pads and similar flexible heating appliances", the safe service life of electric blankets is 6 years from the date of production, and the safe service life of electric heating pads is 3 years. Moreover, the standard clarifies that the product must be accompanied by a text or symbol mark of the safe use life, and it is clearly marked on the instruction manual according to the relevant national standards. If there is no label, consumers must be vigilant.