Precautions When Using: Car heater is a high-power product in the car.The current is 12A.It cannot work for a long time (40-60 min).It cannot be used for a long time when the engine is turned off to prevent battery shortage.The protection current of the car thermostat is 15A,the one less than 12A cannot be used,and the cigarette lighter port mark is greater than 200W can be used.Take care to avoid touching the cigarette butts when pulling out the plug after using the heater for a long time to avoid burns.The product positioning is not to replace the air conditioner,but to serve as a warm air defogger with auxiliary heating function. Power Current Limit Solution: Go to the 4s shop to find an electrician to modify the cigarette lighter line,bypass the current limiting device and directly connect to the cigarette lighter Use a straight connection,lead from the battery,two wires can be used normally