"Enjoy the ultimate home theater experience with beFree Sound's 5.1 channel surround sound Bluetooth speaker system. This speaker system is sophistication and style, 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. * 6.5" amplifier + 3" speakers x2* output power:40w+10w*2* frequency response:40hz-20khz, * separation:≧50db, * s/n ration:≧75db* features: Usb/SD/FM/Bluetooth/remote."