Includes two CHAT 150 speakerphones, two USB cables, Attach cable and power supply. Group USB PC speakerphone brings clear, full-duplex audio conferencing to medium and large conference rooms Speakerphones for individual, small, medium or large group use. The CHAT 150 and CHATAttach 150 USB connect to PCs for rich, full-duplex audio communications and can be used with VoIP softphones, Web collaboration, instant messaging and any other applications requiring two-way audio. A perfect addition to the office or conference room for greatly enhanced collaboration. The CHATAttach 150 can be used with many applications requiring two-way audio (VoIP softphones, web collaboration applications, instant messaging), connected with enterprise phone systems (ad-hoc bridging capabilities allow a USB/analog mix) or simply used as a large loudspeaker for audio playback. Unsurpassed audio clarity ClearOne's, market-leading, HDConference™ audio technology Proprietary echo and noise cancellation algorithms prevent distracting audio Full-duplex audio means no cutting in and out Automatic gain and level controls adjust mic and speaker levels automatically First-mic priority intelligently focuses mic levels based on who is speaking Adaptive modeling-continuously samples room acoustics for any changes Three built-in microphones array with 360° audio pickup up to 8 feet Large loudspeakers for rich, clear conferencing or audio playback Wideband audio frequency response (20Hz-20kHz) Ease of use Powered solely through laptop USB Simple audio bridging between PC applications and analog telephone Breakout box connection for further connection options (enterprise telephones, video conferencing) Easily manage conference calls with 1 to 6 participants True plug-and-play operation.