Poly Voyager Focus B825-M UC Microsoft Teams Certified Headset + Charging Stand - Microsoft Teams Certification - Siri, Google Assistant - Stereo - USB Type A - Wireless - Bluetooth - 98.4 ft (30 m) - 20 Hz to 20 kHz - On-ear, Over-the-head - Binaural - Supra-aural - Electret Condenser, MEMS Technol