The DX705 is a universal DC power line filter that filters out line noise & electrical interference from your radio equipment. Works universally with CB radios, amateur/marine/business band transceivers, car audio head units and more. It is bi-directional, so it works in either direction, but polarity still matters, so don't cross up your positive and negative wires. Simply connect the filter in between the DC power source and your radio's power cord.
