A universal interrupt switcher designed for vehicles having an aftermarket stereo with a 2 or 4 speaker system
The CBM-U4AM is similiar in price to an external speaker, but with far more benefits. An external speaker does NOT mute the stereo or automatically switch to vehicle speakers.
Designed and manufactured in the USA.
Use with the TDS-15A Transmit Detector Switch to be able to transmit messages for an additional $59.95.