Speaker selector switch inserts from Impact Acoustics(?) add versatility to your whole house audio system. Speaker selector switches allow you to select between two sets of speakers. You can listen to the speakers in your living-room or send the sound to a set on your patio. These inserts are stamped from 20 gauge steel and painted to match the room d‚cor. Mount in standard electrical boxes or mud rings and finish off with a standard decorative wall plate. With a screw-terminal block on the back, these wall plates are simple to install and use.