The PCB-P Encoder Assembly with OEM no.SE00000277 is a genuine Makita part for the following jobsite radios :
BMR104 BMR104W DMR104 DMR104W.
This PCB is the part that controls the selector wheel so you can either turn the volume down or chainge radio stations,so if your radio is stuck at a high volume or will no longer change station it may be time to replace the PCB
This will fit all models listed below