This is the only portable conference system that allows you to use your Bluetooth®-enabled cell phone for conference calls. The system provides crisp, clear sound from its built-in 5-watt speaker and receives signals up to 30' away from a paired cell phone. It has three sensitive microphones that provide 360° of coverage. Full duplex sound eliminates voice cut-outs and clipped words for clear conversations. Built-in echo-cancellation technology constantly adjusts itself to optimize the audio for different room environments, reducing background noise so there's no need to shout to be heard. You can synchronize your cell phone's contacts (up to 6,000) with the system and place your calls using its easy-to-read TFT display and keypad. The system provides 10 hours of continuous talk time from a five-hour recharge of its three Li-Ion batteries (can operate using AC adapter; not included). 2 1/4" H x 11" Diam. (1 1/2 lbs.)