1. Black body, LED display and fine workmanship make the whole product stylish and beautiful.2. The input voltage of this charger is 12-24V, which has wide application. Suitable for all boats and vehicles with 12-24V.3. Equipped with 4.2A dual USB and can be used to power mobile phones, tablets, GPS, etc.4. Comes with a voltmeter to detect the use of the car battery at any time and effectively prevent safety accidents caused by poor battery condition.5. Includes a 60 cm red-black line with OT connector, simple and easy to install and use.6. IP66 waterproof function, don't worry about the impact of water.Specification:Item Type: Dual USB Digital VoltmeterCondition: Brand new Size: approx. 2.9 cmLine Length: approx. 60 cmMaterial: ABSHousing Color: BlackLED Color: Red, Blue, Green (optional) Input Voltage: DC12-24VOutput Voltage: 5VOutput Current: 4.2AReverse Protection: YesMeasurable Voltage: 6-38VWorking Temperature: -20°C - 80°CWaterproof Rating: IP66Installation Area: Can be installed in large running tools such as motorcycles, cars, ships, yachts, RVs, buses, etc. Application: Used to power most mobile products such as mobile phones, tablets, navigation and GPS. Wiring Instructions: + \" on the copper contact behind the product is connected to the positive pole of the power adapter. - \" is connected to the negative pole of the power adapter. Package List: 1 x Dual USB Digital Voltmeter1 x 60cm/23.6 \" Red Black Line