Niles SS-4 Speaker Selector Power Handling: 100 Watts Per Channel RMS, 200 Watts PeakProtection Circuit Safeguards Receiver/amplifier Separate Left And Right Ground Paths For Compatibility With All Amplifiers, Including Bridged Designs Removable Screwless Connectors Accommodate Up To 14-gauge Wire. Rugged All Metal Chassis Construction. Nonskid Feet Won't Scratch Furniture And Ensure Unit Stability During Operation72 Adhesive-backed Room Identification Labels Requires An Amplifier That Is Compatible With A 4 Ohm Load 10 year limited Handles up to 100 watts per channel RMS Protection circuit safeguards receiver / amplifier Separate left and right ground paths for compatibility with all amplifiers, including bridged designs Removable screwless connectors accommodate up to 14 gauge wire Rugged all metal chassis construction