AUTOMATIC SPEAKER SWITCH, 200W, 12VDC Perfect for when two independent sound systems feed a single pair of speakers Inputs are identified as A and B, with INPUT-A as the default When an audio signal is detected at INPUT-B, the switch automatically switches to that input When INPUT-B is is silenced, the output automatically reverts back to INPUT-A The delay time for reverting back to INPUT-A is adjustable from 0.5 seconds to two minutes