Niles SPS-4 Speaker Selection System, used but in nice cosmetic and working condition. High quality audio component, doesn't come with any instructions or cables, however this item is simple to operate and doesn't require any instructions or power cables (just your own speaker wires). Please note someone has added a couple labels to the speaker stations (Den, Sun Room). Add up to 4 pairs of speakers to your system. Protection circuitry is built in, so there's a safe operating load for any amplifier or receiver rated up to 100 watts per channel. Accepts speaker wires up to 14 gauge or pin connectors.