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Enjoy the ultimate home theater experience with be free sound's 5.1 Channel surround sound Bluetooth speaker system. This speaker system is sophistically designed, featuring a sleek look and smooth sound. With Bluetooth, USB, SD and FM radio capability, the system offers the best possible listening options for your enjoyment.* 4 " amplifier x 1 + " speakers x5* output power: 20W+5w*5* frequency response: 40Hz-20khz, * separation: ≥50Db, * s/n ration: ≥75Db* features: USB/SD/FM/Bluetooth/remote.