Anchtek Motorcycle USB Charger QC3.0 Handlebar Fast Charging Waterproof 12V Socket Adapter With Voltmeter Motorcycle Accessories Specification Power Input: DC 12V Weight: 142g Output interface: 5V3.4A/9V2.5A /12V2A Materail: High and Low Temperature Resistant Environmental Protection Material Features 1. 6.8A QC3.0 super quick charger 2. Support 2 devices to charge at the same time 3. Red led voltage measurement 4.Two installation methods : Handlebar Mounting Accessories ; Screw Mounting Accessories 5.Widely used : cell phones , tablets , sports cameras , Mp3/Mp4 , car recorder , game consoles ,usb lights , camcorders etc. Wiring Instructions: Method 1: If your vehicle has a SAE socket ,and the polarity is consistent with our product , directly connect and use it Method 2 : If your vehicle has a SAE socket , but the polarity is opposite with our product ,please use the SAE reverse polarity adapter first , and then connect it. Method 3: When you want to directly connect the battery to use, just use the power extension cord provided by us. Description : 1.It comes with a waterproof dual USB cover, which is fully competent for Outdoor Usage. 2. This USB Charger Socket is made by ABS Environmental Protection Material, which is fire-retardant, high and low temperature resistant and anti-corrosive. 3. Including Dual USB charger and voltmeter, dual USB outputs can charge two devices simultaneously, digital voltage display helps to monitor vehicle's electrical safety.