Motorcycle USB Charger with Voltmeter and On/Off Switch 5V 3.1A Dual Power Port JARDLI 3 in 1 motorcycle usb charging system: dual USB output, red digital voltmeter, on/off switch button, with 21.5 inch built-in fuse cable. Wide input voltage: 12V to 24V, suitable for motorcycles. Dual USB output: DC 5V 2.1A / DC 5V 1A, suitable for charging mobile phone, tablet PC, camera, iPhone and GPS. Red digital voltmeter as a battery tester for checking the state of your battery and battery charger. Fast charging with intelligent protections of over-current, voltage-absent, over charge, over-discharge, and short circuit. Handlebar mount, can be used on 7/8" and 1" handlebar, maximum diameter is 30mm.