SILK DOME TWEETERS - High quality 19mm (3/4 inch) tweeters reproduces treble in every detail 4-INCH BASS DRIVERS - Balanced natural sound with the 4-inch driver and a bass reflex port to enhance bass. 6 ohm impedance WALL-MOUNT BRACKET BUILT-IN - Hang these speakers on the wall as rear surround speakers for your home theater RECEIVER OR AMPLIFIER REQUIRED - Connect an amplifier or receiver to power these speakers to your taste. Speaker wires included. 2 YEAR WARRANTY - Guaranteed high quality and reliability with hassle-free parts and labor warranty for two years in USA and Canada.