Base circuit board for VBX4000 and VBX5000. NOTE: If the speed dial is broken, the head unit circuit board will likely need to be replaced as well.VBX Base Circuit Board$120.00PriceModel*SelectQuantity*Add to CartDimsBase Circuit Board: 6" x 4" x 2" InstallClick for installation instructions. You may have to jump to the relevant part of the video, depending on the repair you're doing.