Description: 2 in 1, dual USB port charger and red led voltmeter Handlebar mount, can be used on 7/8 ” and 1 ” handlebar, maximum diameter is 30mm With on/off switch, With waterproof cover Can be used to charge GPS, cell phone, MP3 or interphone. Can be used on motorcycles, ATVs, Quad bike or snowmobiles. Specification: Input Voltage: DC12V-24V Output Voltage: DC5V Output Current: 2.1A and 1A Total 3.1A current output. Upper port is 2.1A, under port is 1A Voltmeter Operating Voltage: DC 8~28V Voltmeter Operating Current: under 10mA Voltmeter Refresh Frequency: 10 times per second Led Color: Red Power Cable Length: about 50cm With High-Tech IC, decrease charging current when the battery is nearly full With reverse polarity protection With overload protection Package Includes: 1 Piece Motorcycle USB Charger