Portable Heavy Duty Digital Air Compressor Tyre Inflator with LED Light DC 12V Description * The car air pump only works with DC 12V power source. * To use the car air pump, start the engine before plugging in the power cord. * The car air pump is not applicable to LT, HT and Truck Tires. * After the car air pump is working for 8 minutes, make it turn off for 10 minutes. * Three meters long power cord , can be easily connected to the front and rear tires. * The default value of this air pump inflation default is 300PSI, if you want to set the default value adjustable button (+ The key is up, the -key is down.) * After setting the default value ,wait for 3 seconds , exit he preset mode, and detect the current air pressure in real time , Air Pressure Pump Specifications Product power: 120 W Operating voltage: DC12V Power cord length: 9.8 feet Weight : 1.8lb Size: 7.8 x 6.2 x 2.3 inches Maximum pressure: 300 PSI Power supply type: car cigarette lighter Continuous work time : 8 minutes Package Contents ? 1 * air pump 3 * adapter