The BG-SMB-4M is a USB/Bluetooth/2.4G wireless speakerphone. It is equipped with an integrated high-fidelity omni-directional microphone to provide a 360-degree pickup, up to 12 feet away. This speaker can quickly connect to laptops, smartphones and tablets via the USB, Bluetooth, or 2.4G wireless connections. The rechargeable battery features a 4-hour battery life for performance on the go. The 3.5mm headset port allows users to switch from a conference call to a private conversation. With full-duplex echo cancellation, noise reduction, and ultra-wideband HD voice technology this speaker provides crystal clear sound free from echoes or distortions. Capable of volume levels up to 85dB, its also equipped with a line out connection for situations where more volume is needed.