Compatible with Bluetooth,USB,SD,and more devices Features subwoofer for producing clear and strong sounds Speaker offers a frequency response from 40Hz-20KHz Enjoy the ultimate home theater experience with BEFREE SOUND'S 5.1-Channel Surround Sound Bluetooth Speaker System. This speaker system features 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. Includes: one 5.25 in. amplifier,five 3 in. satellite speakers,1 audio cable,3 DVD connection cables,users manual,remote control (batteries not included),1 FM antenna Output power: 30-Watt sub-woofer,10-Watt x 5 speakers (80-Watt total) Frequency response:40Hz-20KHz Separation: 50dBs/N ration: 75dB Bluetooth.