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 PSIPower supply type:car cigarette lighter?Continuous work time: 8 minutes ?Package Contents?1 * air pump3 * adapter