Insert the air nozzle on the head of the rubber tube directly over the tire valve. When you hear the sound of air leaking from the tire, it means the air has been circulated. Keep tightening the air nozzle and the air will no longer leak.When inflating, the meter needle rises with tire saturation. When the needle reaches the appropriate tire pressure ( generally, the tire pressure of a car tire is 223kpa=35PSI), remove the cap and the air nozzle, and the job is done.The pure copper motor does not heat up and makes low noise, accelerate heat dissipation and continuously inflate without heating, no gear structure, no impact noise, reduce noiseWith its own lighting, it is not more stained at night, it is convenient to use in special circumstances at night, and the wiring groove is hidden, beautiful and practical, and the power cord / inflatable tube is placed in the machineWhen =' a normal tire is inflated, it will take about 3-5 minutes to reach the normal tire pressure of 3OPSI, but it will take a little longer for a fat tire. If the tire is blocked, the air does not enter. At this point, you must immediately unplug the air nozzle connector and start again, otherwise the motor and the instrument will be easily damaged.