How to adjust the plasma of 40 built-in air pump

1. First, the 40 built-in air pump control box (with red button) has a small hole. Use a screwdriver to adjust the screws inside and adjust the air pressure of the air pump.

2. Secondly, the way to look at the value of the car air pump: look at the unit first, so you can dial 2.4 and 2.8 for bar, 35-40 for PSI, and 240-280 for KPA. If there is an M key, set the preset value, then start dialing, and then stop when you hit the preset value.

3. Then, if there is no preset, call directly, see the value, and stop when it arrives.

4. There is a red line in the last 2-3, and the tire pressure of the normal car is between them. When the pointer reaches the middle, you can stop. This is not good, but it is better to set a number.