1. Constant temperature 5 seconds fast heating, no odor, silent operation, cycle heating, no oxygen consumption.2. With warm function switch, easy to operate.3. Allows you to defrost/defrost your car windows quickly and efficiently so you can get to your destination.4. Thick and long pure copper cable, it will not get hot during use and will not damage your car battery.5. Car heater defroster 600w high power defrost fog machine 12v / 24v car heater automotive supplies Product specifications:Drive mode: independentControl mode: manual adjustmentVoltage: 12v / 24vPower: 500WColor: blackSize: 15 * 12 * 9cm / 6 * 4.7 * 3.6inPrinciple: Ptc ceramic heating elementMaterial: stainless steel flame retardant material Packing method1x heater2x double aluminum air outlet2 alligator clips2x clips (Clip)1x screw set Remarks:Please choose the right one according to the battery car. The 12v car is an ordinary battery car, and the 24v car is a two-section battery car, which is suitable for general large trucks. Instructions:The red wire is connected to the positive pole and the black wire is connected to the negative pole. It must be matched with 4-6 square pure copper wire. Precautions:1. Must be used with battery2. Product positioning cannot replace air conditioning, but will appear as auxiliary heat3. The product is ready to turn on and can be used for auxiliary heating, defogger and defrost before the car warm air comes out.4. It is recommended to use the heater when turning on the vehicle to avoid causing the vehicle to fail to start.