Digital Air Compressor for Car Auto Pump Portable Tire Inflator with LED Light DC 12V

1.Insert the cigarette lighter plug into the DC 12V jack inside the car and start the car. 2.Three meters long power cord , can be easily connected to he front and rear tires. 3.Screw the inflation nozzle onte he tire that needs to be ventilated. 4.The button description :R key is the unit conversion key; - key is he minus key; + key is the plus key, any press - or + key enter the preset mode. 5.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.) 6. After setting the default value ,wait for 3 seconds , exit he preset mode, and detect the current air pressure in real time. 7.Pump up to the set value and stop pumping automatically. 8.When you re-inhale, you need to turn the switch off and then on again to start pumping again. 9.The car air pump , continuous working time should not exceed 8 minutes, need to rest nitermittently.