ITEM NAME:5V 2 USB Motorcycle Waterproof Phones Charger Socket Adapter Voltmeter Red Description: Mount Hole for 22-25mm(0.86-0.98 inch) Handlebar Applicable models: Motorcycle, ATV, Cross bike, Scooters and so on This USB Charger Socket is made by ABS Environmental Protection Material, which is fire-retardant, high and low temperature resistant and anti-corrosive, charging faster and more secure. Waterproof and dustproof,Dual USB charger High visibility LED display indicates the battery voltage when power on. Specification: Material: Plastic+Metal Product Color: Black Voltmeter Indicator light color: Red/Yellow(optional,as you choose) Input voltage: DC 12V-24V,USB Output: DC 5V 3.1A (2.1A+1A) Black: Negative Red: Positive Package Includes: 1 Piece Motorcycle Dual USB Charger Socket.Applicable models: Motorcycle, ATV, Cross bike, Scooters and so on. Red: Positive.