Insert the top valve of the rubber hose directly into the tire valve. When you hear the tire flattening sound, it means that the air has circulated. Tighten the steam charging knob. When inflating, the pointer of the meter starts to rise with the air pressure, and when the large pointer reaches the appropriate tire pressure of the car generally, the tire pressure of a car is 30-40PSI, turn off the inflator switch and take out the plug and air nozzle. Please use the equipped professional ball needle and nozzle to connect with the air nozzle to inflate the ball and other air-requiring equipment.