Specification : Material: PCandABS Input voltage:12V-24V Output voltage: Dual QC3.0 Operating temperature -40℃, maximum 80℃ Instructionsand''to the positive pole''-''to the negative pole'' Product features: Flame retardant, high temperature resistance, corrosion resistance, durability and deformation resistance. Six layers of protection: 1. overload protection 2. About temperature protection 3. Short circuit protection 4. Overload protection 5. Overcurrent protection 6. Sudden wave protection Product installation: 1. Select the installation position of the car charger to open the hole or keep the installation position. 2. Disassemble the board, install the car charger, and tighten the nut to fix it. 3. The positive electrode (red line) of the car charger is connected to the fresh-keeping box of electric power The negative electrode (black line) is afraid 4. Connect the positive and negative poles of the car charger and fix the position of the car charger. Kindly Notes: 1. The voltage will display by connecting to the battery. 2. Since the iPhone series does not support fast charging, charging the iPhone is normal speed. 3. For mobile phones that support fast charging, you must use the original charging cable or fast charging cable to achieve fast charging. 4.For vehicles, it's recommended to get power from fuse box, while for the motorcycle, better connect to the wires of the key switch. Package Includes: 1x Dual USB Ports Charger 2x Blue Terminal 1x Red or Black 60cm wire with fuse or Package Includes: 1x Dual USB Ports Charger 2x Blue Terminal