The X300 mobile speaker can also function as a speakerphone, as it has a built-in microphone. The speaker is designed for wide-range sound, the drivers are uniquely angled for a more expansive sound spectrum. It is used to connect your smartphone or tablet for a mobile theater experience. The speaker can operate up to 30ft wireless range. It can connect instantly and adjust volume and manage phone calls with the tap of a finger. This surprisingly powerful mobile speaker delivers a deep, precise bass response and detailed mid- and high-range sound. The speaker is compatible with popular smartphones and tablets. Some functions may not be supported depending upon your phone, tablet and/or application.