Package : 1x Heater 1x Double Aluminum Air Outlet 1x Air Switch 1x Double Clamp Remarks： Please Choose The Correct One According To The Battery Car. The 12v Car Is A General Battery Car, The 24v Car Is Two Battery Cars, And The General Large Truck Is Suitable. 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 Squares Of Pure Copper Wire. Precautions： 1. Must Be Used With Battery 2. Product Positioning Does Not Replace Air Conditioning, But Appears As Auxiliary Heat 3. The Product Is Ready To Open, Can Be Used For Auxiliary Heat Before The Car Warm Air Comes Out, Defogging And Defrosting 4. It Is Recommended To Use A Heater When Opening The Vehicle To Avoid Causing The Vehicle To Fail To Start. Description： 1. Constant Temperature And Rapid Heating, No Odor, Silent Operation, Circulating Heating, No Oxygen Consumption. 2. With Switch For Warm Function, Easy To Operate. 3. Allows You To Defrost/demist Your Windows Quickly And Efficiently So You Can Get On The Road To Your Destination. 4. Thicker And Long Pure Copper Cable, Won't Get Hot During Use Nor Damage Your Car Battery. 5. Car Heater Defroster 15000w High Power Defrost Fog Machine 12v/24v Car Heating Car Appliances Product Specifications: Drive Mode: Standalone Control Method: Manual Adjustment Voltage: 12v/24v Power: 1500w Color: White Size: 12*10*18cm Principle: Ptc Ceramic Heating Element Material: Stainless Steel Flame Retardant Material