LAAGIE Waterproof DC 12V-24V LED Digital USB Voltmeter+Dual USB Power Socket Panel 2.1A 1A USB Charger For Car Boat Marine Rv ATV Carvans Motorcycle Vehicle Boat Marine Carvan One combination voltmeter and duel USB charger that operates off of 12-24 volts USB outlet 5V up to 2.1A. The material are high quality and waterproof can be used for outside operatio Applicable Models:Cross bike, scooters, cars, RV, Boats Optimised for iPad, iPhone & iPod - fast charging at full speed (2.1Amps for iPad, 1Amp for iPhone/iPod).