Product Features:Flame-retardant nylon is odorless and durable Installation??Please first use the hole opener, the hole opening position, put the product in, then screw down the screw fixing ring! Application??Input 12-24V output 5V/4.2A fast charging mobile phones, tablets, GPS and other devices.Universal for all 12V-24V cars,bus,trialer,boats,utv,atv,etc. Protect??With overcharge protection, it can automatically stop charging when the device battery is fully charged and over-temperature Over-temperature protection, over-voltage protection. Warranty??The Dual USB car charger has CE certification.If there is any quality problem,It can be replaced within a year. waterproof and Dustproof IP66 waterproof rating,protect internal circuit and prolong service-life.,The red line is connected to the positive terminal of the power supply, and the black line to the negative terminal of the power supply. Package include: 1*Dual USB Car Charger Adapter 2*terminals