Theatre Box - 360-Degree 3D-Sound Portable Speakers (Black) 360 degree surround sound, virtual 3D effect, you are in the "sweet spot" anywhere in the room, 4.1 system (four 2 inch full range drivers, one 3 inch powered bass driver) delivers up to 125 watts of power 3 lithium ion batteries required (included) Built-in microphone for hands-free calls (Bluetooth conference call) Connects via Bluetooth 4.0 and mobile devices with NFC or a 3.5mm stereo cable (included) Plays music up to 30 feet (10 meters) from any Bluetooth-enabled device such as your smartphone, notebook or tablet