Poly Sync 20+ Microsoft Teams Certified USB-C Speakerphone (772D1AA) - Connectivity: USB Type-C / USB Type-A / Bluetooth 5.1, Speaker size: 40 mm, Number of microphones: 3, Cable Length: 71.5cm, Touch User Controls: Call/answer end, Mute, Volume +/-, Programmable Function Button, Microsoft Teams, Battery type: Rechargeable Li-ion, Battery life: Up to 20 hours (talk time)