ALLOWS YOUR CB ANTENNA TO SIMULTANEOUSLY WORK AS AN AM/FM ANTENNA;NO TUNING NECESSARY;30 WATT MAXIMUM INPUT POWER RATING;WORKS WITH STANDARD CB ANTENNAS - NOT RECOMMENDED FOR USE WITH NO-GROUND ANTENNAS;INCLUDES: (1) Multiplexor Box, (1) 2' Male BNC to Male Motorola plug, (1) 2' Male BNC to PL259