Voyager PCM12V5A 12V5A Power Control Module ONLY, Needed when Installing a Voyager Monitor in a Heavy Duty Vehicle, Blocks Power Line Noise from Showing Up on Video Display Needed when Installing a Voyager Monitor in a Heavy Duty Vehicle Filters Out Alternator Whine Blocks Power Line Noise from Showing Up on Video Display Serves as an Extra Level of Circuit Protection Weight 5 lbs