A universal interrupt switcher designed for vehicles having an aftermarket stereo with a 2 or 4 speaker system

The CBM-U4AS  has far more benefits than an external speaker which 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.

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Contact us today at info@audiointerrupt.com or call us at 1-858-349-4918.