SW-L1 LINE LEVEL AUDIO AB SWITCH BOX UPTO 24V SPDT RELAY OUTPUT MCLELLAND SW-L1Features Automatically switches the signals to one power amplifier between two inputs. Delay Switch allows setting the Delay time from 0. 5 Seconds to 2 Minutes to change the music automatically. Sense Level allows the adjustment of sensitivityto the desired Threshold. A B Status LED indicate the music plays from Input A or Input B. Provides a SPDT(Single Pole Double Throw) outputcontact. External power supply required . Mounting hole for easy