Cllena Dual Port USB Charger Socket Power Outlet 2.1A & 2.1A with LED Voltmeter for Car Boat Marine Motorcycle Mobile (Green)

Specification: Rating Voltage: 12-24V USB Output: 5V / 4.2A Interface: dual USB ports Material: Copper + ABS Plastic Voltmeter Dimension: 2.1" x 1.4" x 1" Bracket Dimension: 2.4" x 1.7" Operating Temperature: -40 to 70? Wide Application: cars, motorcycles, ATVs, SUVs, UTVs, Boats, etc Multi-purposes: supply power for cellphone, tablet, GPS and other USB-devices Package Included: 1 x Dual USB Voltmeter 2 x Insulated Terminals Please Note: Regarding the each usb port 2.1A, it meant 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. Please feel free to contact us via e-mail regarding our products or service. Thanks a lot!