【QUICK HEATING IN 5 SECONDS】800W high power car heater made with PTC ceramic heating element. Provide conveniences for travel, camping, glass defrost fog. 【MULTIFUNCTION】Used for windshield defrosting, demisting and defrosting. And preheat the engine coolant to prevent the wear of the engine started at low temperature. 【Less noise】The quiet fan is quiet and noiseless when working, creating a good environment for you. 【Easy installation】 Do not open the internal circuit and special circuit, when installing, connect firmly, use the red line and black line negative electrodes live. Don't get me wrong, to avoid burning out the fan, it is recommended to use copper wire, connected directly to the battery or a car generator. No long-term use, in order to avoid wasting dry battery, does not affect the start.