Check the listing for details. Niles SS-4 4-pair Speaker Selector. Condition: New. Listed at 119.00 USD. What's in the boxSpeaker selector Sheet of self-adhesive Room/Zone Labels Installation and Operation Guide Warranty and Registration card About this itemWritten by Crutchfield's Barry MontgomeryThe Niles SS-4 lets you send music from a single amplifier or receiver to four pairs of speakers throughout your home. Push-button controls let you turn each pair of speakers on and off independently. Selectable impedance-magnifying circuitry prevents damage to your receiver or amp, letting it safely drive all four pairs at once. Details: handles up to 100 watts per channel selectable impedance magnification safeguards your system requires an amplifier or receiver capable of driving a 4-ohm load accepts speaker wires up to 14 gauge or pin connectors includes room/speaker labels rugged all-metal chassis 8-9/16"W x 2-1/16"H x 6-1/2"D warranty: 10 years