Motorcycle Dual USB Charger + Voltmeter

2-in-1, dual USB port charger and LED voltmeter, with on/off switch.
Can be used to charge GPS, cell phone, MP3 or interphone.
With waterproof cover, suitable for outdoor use.
Handlebar mounted, can be used on 7/8" and 1" handlebar, maximum diameter is 30mm, replaceable 5A fuse tube.
Total 3.1A current output. Upper port is 2.1A, under port is 1A, with 60cm power cable.
With high-tech IC, decrease charging current when the battery is nearly full.
With reverse polarity protection, overload protection.
Wide operating voltage range, up to DC 28V.
High refresh frequency,Low power consumption.
Tips:
The power cable is with 6.3mm connectors, you can change the power cable by yourself.
If the 2.8mm connector plug is not suitable, you can remove the plug and connect to the circuit directly. 
Connect the red line to the ACC terminal on car or ignition lock “ON” terminal on motorcycle. Connect the black line to the ground terminal.
Or connect it directly to the battery on your motorcycle. Remember turn on it if you don’t want to use it.