Poly Voyager 4320 USB-A Headset + BT700 Dongle (76U49AA) - Connectivity: Bluetooth 5.1, Speaker size: 32mm, Number of microphones: 2, Microphone type: Noise cancelling, Ear cushions: Artificial leather, Battery type: Rechargeable Li-ion, Wireless range: Up to 50m, Voice alerts, Button User Controls