Socket mounts with a retaining nut, not a press fit that can vibrate loose. Can be used with a locking plug. Easy to install, + to the positive pole. – to the negative pole Works with any standard cigarette lighter plug and suitable for any 12V – 24V vehicles (motorcycle, boat, truck, ATV, RV) in need of extra and heavy duty cigarette lighter plug sockets The safety Charging design will prevent your devices from over-heat, over-current, over-voltage, over-load, and short-circuit Waterproof and dustproof by a rubber cover, protects the internal circuit, effectively enhance its lifespan Package includes: 2 pack Car cigarette lighter, 4 Insulated Terminals, 4 screws, 2 Black/Red wires with 10Afuse Fit Type: Universal Fit Product description 2 Pack 12V Cigarette Lighter SocketApplication: Suitable for any 12V – 24V vehicles (motorcycle, boat, truck, ATV, RV) in need of extra and heavy duty cigarette lighter plug sockets. . Can be used with car r to their cell phones, GPS, car audio, car MP3 player, car cleaners, etcWiring instructions:Red wire to the power supply “+”,Black wire to power supply “-“.