PLF1520 - ProComm 15 Amp Universal DC Power In-Line Noise Filter, Installs between the CB or Stereo and DC Power supply to filterout the in-line engine noise & reduce electrical interference., 0-20v DC @15A continuous - 20A Peak, Bi-directional filter- Works either direction., Works universally -Installs in minutes, Color coded jacks forsimplicity, Compact size for easeof placement, Detailed instructionsfor optimum results included.