Beyerdynamic Phonum Wireless Bluetooth SpeakerphoneThe Phonum Speakerphone is an ideal solution for mobile conferences over the Internet in the office or at home. The primary operation is via Bluetooth with a PC, laptop, or smartphone. In addition, it has a USB port as a secondary interface, so that the device can be used even with poor radio communication. Phonum allows small conferences, including video or teleconferencing, with participants at remote locations. In the office or conference room on