Enjoy the ultimate home theater experience with beFree Sounds 5.1 Channel Surround Sound Bluetooth Speaker System. This speaker system is designed with sophistication, 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 x1 + 2.75" Speakers x5 * Output power:20W+5W*5 * Frequency response:40Hz-20KHz; * Separation:>=50dB; * S/N Ration:>=75dB * Features:USB/SD/FM/bluetooth/Remote