Plug the DC plug into the 12V DC socket.
Press the pressure unit toggle button to select the unit you need.
Press the pressurizing button or decompressing button to set the pressure value you need, with the range of the pressure value from 0 to 20PSI, (1PSI=0.0689BAR)
After finishing the above steps, press the power switch button to start to inflate.
During the inflating process, you can press the pressurizing button or decompressing button to increase or reduce the pressure value, press the pressure unit toggle button to switch the unit, and press the On/Offbutton to stop.