Quick Charge QC 3.0 36W Car Dual USB Charger Socket Waterproof with Voltmeter Switch for 12V/24V Motorcycle ATV Boat Marine RV, Black

1. The voltage will display by connecting to the battery. it's recommended to get power from fuse box, while for the motorcycle, better connect to the wires of the key switch. 3. For mobile phones that support fast charging, you must use the original charging cable or fast charging cable to achieve fast charging. 2. Since the iPhone series does not support fast charging, charging the iPhone is normal speed. We are not the kind of cheap ones without a switch button, we are controlled by a button switch.syi