Amplifier for cars Remote audio playing triggers Signal Switcher with CD stacker

This device connects to the speaker output of your car's head unit or amplifier. Once it detects that there is audio playing it triggers a relay so you can trigger other audio components, including an amplifier or CD stacker. It features a 2-3 second delay to help avoid any turn-on pop in aftermarket amplifiers. SpecificationsLength : 58.0mmWidth : 45.0mmDepth : 28.0mm