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
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