Specifications:Rating Voltage: 12-24VUSB Output: 5V / 4.2AInterface: dual USB portsMaterial: Copper + ABS PlasticVoltmeter Dimension: 5.3cm*3.5cm*2.5cm/2.1" x 1.4" x 1"Bracket Dimension: 6*4.3cm/2.4" x 1.7" Features:-Fits for Car, Boat, Marine, ATV, RV, Motorcycle and other 12-24V Vehicles.-Wide Compatibility: Use for mobile phones, Tablet, GPS, digital cameras, PDAs and other USB accessories.Charge your devices fast and safely.-Real Time Monitoring Voltmeter: Combined dual USB interfaces and LED digital display voltmeter into a combo. With built-in intelligent voltage monitor, 2-in-1 voltmeter is able to show you an accurate voltage value at anytime while you're driving, helping you to easily notice the battery running condition. Package Included: 1 x Dual USB Voltmeter2 x Insulated Terminals or add 23.7 Inches Wire Note:Regarding the each usb port 2.1A, it mean the maxi ampere of each usb port is 2.1A, if your device has no 2.1A itself, you use the ammeter could not test 2.1A. and you can use the device has 2.1 itself, for example: you can use ipad to test it, it can prove each usb port is 2.1A.
