Features: Dual USB, can be powered to two devices at the same time USB maximum current is 3100mA, charging ability is strong, fast charging Intelligent identification of device charging current, protection device battery Built-in overload over current protection. Wiring instructions: the red wire represents the positive pole, and the black wire represents the negative pole Specification: Material: ABS, PC, electronic board Voltage: Input DC12V/24V USB socket output voltage DC5V current 3100mA Size: 8.5cm x 5.5cm x 4.4cm length, width and height Line length: 19cm Packing list: 1 x Cigarette lighter .