About this item 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. Filter the cold air in the car to form a thermal air wall. Using anti-oxidant alloy heating aluminum wire, high heat conversion rate, high pressure resistance, fast heating and slow aging, and long use time. Large area of air outlet, Fast heating time, high temperature resistance, 180 degree rotation, convenient and practical.