This FAQ briefly describes how to increase/decrease volume on 2N® Lift8 car unit in proper way without damaging it. Below you will find a few brief steps with photos which ilustrates the procces.
Loosen the 4 screws marked in the picture below. It is not necessary to release them!
Once the screws are loosen, you can move the front plastic plate in way that screw heads will move to the bigger holes as you can see in picture below. After that you can remove the front plate.
Once the front plate is removed, you will gain acces to the potentionmeter which is marked on the picture below. With help of screwdriver you can regulete volume of the car unit. Please be careful with the screwdriver in order to not damage the PCB.