1.Well designed structure with built-in amplifier, high efficiency speaker units and subwoofer is convenient and practical for every kind of audio sources. 2.Acetabuliform vibrancy ring technology. 3.Double voice-coils technology 4.Automatically switch between left and right soundtrack channel of external speaker 5.Aluminum speaker box 6.Small Caliber, big voice-coil technology for Subwoofer 7.Multiple Signal input and output terminals 8.Auto signal detection function 9.Excellent Speaker components 10.Output Power:36 w x 3 11.Sensitivity:86+-3dB 12.Frequency Range:120~18 KHz 13.Power:110~240V 50~60Hz 14.Component Size:1.5" x 4+1 Subwoofer Size:3.5" 15.Color:Silver, black 16.Optional HS-601-300 to be 2.0CH System 17.Optional HS-300 to be 2.1CH System 17.Optional wireless Bluetooth PC connect WP-1 18.WP-2 wireless Mic connector.