Dual-purpose cold and hot, that is, it is hot when it is , and it is cold when it is . Fast defrosting and defogging, silent operation, clearer and safer driving vision. Using anti-oxidant alloy heating aluminum wire, high heat conversion rate, high pressure resistance, fast heating and slow aging, and long use time. Filter the cold air in the car to form a thermal air wall. Large area of air outlet, Fast heating time, high temperature resistance, 180 degree rotation, convenient and practical.