APPLICATION -Widely to supply power for Vehicle, GPS, Mobile phone, camera, mp3. suitable for any DC 12V-24V marine boat motorcycle, boat, riding mower, tractor, car, etc. PREMIUM QUALITY - Car cigarette lighter socket with cover is made of durable flame-resistant hard plastic, will prevent your devices from over-heat, over-current, over-voltage, over-load, and short-circuit., work perfectly with any car powered devices. EASY INSTALLATION - Each socket mounts with a retaining nut against a panel, the wire inline Fuses to protect your plugs from being overloaded, safety and easy to install for daily use. "+ " is for the positive pole,and "-" is for the negative pole. WATERPROOF & DUST-PROOF - Waterproof and dustproof by a rubber cover, protects the internal circuit, also allows it do good job on boat!