Poly Sync 40+ USB-A USB-C Speakerphone + BT700 USB-A Adapter (772C5AA) - Connectivity: USB Type-A / USB Type-C / Bluetooth, Rechargeable Li-ion Battery, 3 Bidirectional Microphones, Battery life: Up to 30 hours (talk time), Cable Length: 1.05m, Touch User Controls: Call/answer end, Mute, Volume +/-, Programmable Function Button, Bluetooth Pairing