Check the listing for details. WORKMAN CBNF3AXX AUTOMOTIVE ALTERNATOR IGNITION NOISE SUPPRESSION FILTER 20AMP. Condition: New. Listed at 37.95 USD. NEW automotive electrical noise filter. Designed for use with automotive communication and entertainment systems including CB radio, ham radio, car stereo, and others. 6Ft 12AWG wiring with 3 pin plug fits standard Cobra, Galaxy, Uniden and other CB radios. Includes an high inductance iron core coil and capacitor L-C filter to reduce interference caused by automotive alternator and ignition impulse noise. Install in series between the affected communication or entertainment equipment and the automotive 12V power source. Measures 3in (3-5/8 w/ flange) (L) x 2-1/4in (W) x 1-3/4in (H). Filter rated at 20Amp maximum, 10Amp inline fuse in positive lead, 4Amp in negative lead (change of fuses for other applications). Visit our eBay store for other radio accessories.