Product details: Name: Car cigarette ighter head Style: 12V Diameter size: 21mm Input voltage: 12V Product material: waterproof cover, high temperature resistant material Wiring method: The forgold in the middle of the base is the positive pole, and the forsilver is the negative pole Power supply location: Common power supply locations such as fuse box, cigarette ighter, ignition switch Special reminder 1 Be sure to pay attention when installing, and do not connect the positive and negative poles in reverse. Since the positive and negative poles are very close, they must be insulated. It is recommended to use electrical tape to fix them; 2 Do not expose the cigarette ighter directly. Exposing the cigarette ighter socket directly may make the cigarette ighter ineffective and even pose a safety hazard. Therefore, it is recommended to cover the cover after unplugging the device; This model cannot be used with data transmission devices such as MP3, Bluetooth and FM. Using improper electrical equipment may cause damage to the vehicle's electrical system. Please pay attention to using appropriate equipment; The cigarette ighter is direct current, so be sure to pay attention to the load when using it. When using a socket, do not exceed the combined power capacity of 12V/120W/10A, 24V/240W/10A; Please pay attention to the voltage when installing engineering vehicles, excavators, loaders, and agricultural vehicles. It is recommended not to connect directly to the battery. The voltage will exceed 12V When wiring, the forgold pin is connected to the positive pole and the forsilver pin is connected to the negative pole. Recommended power supply locations: fuse box, original car cigarette ighter circuit, power switch circuit, it is not recommended to connect directly to the battery. Products include: 1*Car cigarette ighter head Note: Please allow slight size errors (1~2 cm/0.39*0.78 inches) due to manual measurement, which shall prevail in actual receipt; please allow slight color errors under different monitors.