This in wall three way selector switch allows you to select between two pairs of speakers.
You can have acheive the following between two sets of speakers.
Room A ON, Room B OFF
Room A OFF, Room B ON
Room A ON, Room B ON
This three way speaker selector switch is easy to install, you simply wire your speakers from amplifier to this switch, then you wire your two sets of speakers (i.e room A and room B) and connect it to the selector switch.
This is great for sub-rooms or for extending your system into the garden or for larger kitchen and dining room installs.