"* OMNIDIRECTIONAL VOICE PICKUP 3 built-in mics plus one extension mic for 360° ultra-long voice pickup of 8 m. * LONG ENDURANCE Built-in 3000 mAh battery that can last up to 10 hours of conversation. Provide a clear, smooth, and stable audio and video experience. * SUPPORTS TANDEM With flexible cascading, TRI-SPX-10123 can be daisy-chained with other TRI-SPX-10123 via a Tristar daisy-chain cable for larger meeting space needs. * HI-FI SPEAKER Finely-tuned Hi-Fi speaker with explosion-proof sound treatment for treble. * DYNAMIC BACKGROUND NOISE REDUCTION With dynamic noise reduction technology, enjoy clear and smooth video meeting. * WIRELESS CONNECTION Built-in high quality wireless module to connect with various of devices wirelessly and minimize cable clutter."