Feature: 1. Built with anti-flame retardant nylon material, it is reliable, durable, and environmentally protective. 2. Black shell, blue light, and fine workmanship, make the whole product look stylish and beautiful. 3. The input voltage of the product is 12-24V, with very wide scope of use. Suitable for all boats and car of 12-24V. 4. Equipped with 2.4A USB, it can be used for power supply of mobile phones, tablets, GPS, etc. 5. Comes with a voltmeter, can detect the use condition of the car battery at any time, to prevent the safety accident caused by defective batteries. 6. With waterproof and dustproof function, can protect the internal circuit and prolong its service life effectively. 7. Accompanied of an ammeter, to detect the output current of the USB port at any time, safer and reliable. 8. Can be installed in large-scale walking tools such as motorcycles, car, ships, yachts, motor homes, buses, etc. 9. Temperature control chip for long charge, can control the circuit to prevent excessive temperature. Specification: Item Type: 3-in-1 USB chargerCondition: 100% Brand New Opening Size: Approx. 2.9cm/1.1in Material: ABS Item Color: Black Light Color: Blue Input Voltage: DC12-24V Output Voltage: 5V Output Current: 2.4A Measureable Voltage: 6-38V Measureable Current: 0-3A Reverse Protection: Yes Working Temperature: -20 ° C ( the lowest), 80 ° C(the highest) Waterproof Rating: IP66 Size: Approx.5.5x2.6x3.7cm/2.16x1.02x1.45in Installation Range: Can be installed in large-scale walking tools such as motorcycles, car, ships, yachts, motor homes, buses, etc. Application: Can be used to power most mobile products such as mobile phones, tablets, navigation and GPS. Installation Method: Please use the hole opener to open a hole, then tighten with the threaded ring. Wiring Instructions: + connected to the positive pole - connected to the negative pole Package List: 1 x 3-in-1 USB Charger2 x Terminal