Digital home theater 2.1 speaker , Support USB/ CARD port( FV2.1-17) Support USB/ CARD port Input Sensitivity: 450mV Connecting computer, CD player and MP3 player etc. Signal-to-noise: e80dB Speaker unit: woofer 4inch, satellites 2inch Frequency response: 30Hz---18KHz with led light Output Power: 3W* 2+ 6W RMS( ± 10% ) Power Voltage: AC220V( ± 10% ) 50Hz / AC110V 60Hz optional Product size : 99* 183* 139MM ( woofer) 86* 60* 104MM ( satellite) Inner color box size : 247* 201* 189MM Master carton size : 619* 508* 397MM 12 pcs / carton ; 13.7 kgs / carton 20GP: 3276pcs 40GP: 6996 pcs 40HC: 8016pcs Manna Su Manna# fevma.com ( # = @ ) 86+ 18925385060 QQ: 613785758 Skype: manna-fevma