Dear customer, Thank you for choosing our products. If there is any problem with our products, please contact us through the order information. We will be happy to serve you and solve it for you as soon as possible within 12 hours, thank you! With hot and cold switch.This car heater is not only ideal for defrosting/demisting window&windscreens.But also can be used as a cooling fan to give you wind in the summer.You just need to change the switch,then the hot air or cool wind will come out immediately as your needs. EASY&EFFICIENT:Very convenient and easy to use!!!Just plug and play.Instant heating,automatic overheat protect.You can heat the atmosphere of your car without having to wait for the engine to warm within 3 seconds.Effectively allows you to defrost or demist your window quickly so you can get on the road and get to your destination. HIGH QUALITY Ideal for long trips or camping.Being made of high-quality material and premium pure copper cable,our car heater uses longer than others.It boasts large air outlets,long transmitting distance,and wide range,which is more energy-saving with low consumption. INTELLIGENT DESIGN:Compact size,portable and convenient to install.A rotary holder is designed for free adjustment,convenient and practical.It comes with a rotary holder which can be used for adjustment and easy directing just like a car vent,so you can adjust it to your preferred angle. WIDE RANGE OF USES:Car heater suitable for winter cars,camping,travel and warmth.Portable and efficient,it can be heated quickly and easily heated.It is designed to quickly clean the frost,fog even remove snow on your vehicles windshield,keeping your view in driving is clearly and ensuring your driving safety.