ProSolutions SBX4 4 Pair Speaker Selector, a versatile audio accessory, connects up to four pairs of speakers to a single amplifier or receiver. I believe ProSolutions was a forerunner of Tivoli Audio.

Compatible with a variety of brands and types of speakers, making it a great addition to any home audio system. Easy-to-use multi-room functionality. 

Listen to music in multiple rooms or just simplify your setup.

Was working when disconnected last week.