Poly Sync 20+ Speakerphone USB-C/A Adapter (B95VKAA) - Connectivity: USB Type-A / Bluetooth 5.1, Speaker size: 40 mm, Number of microphones: 3, Microphone Type: Three-microphone Steerable Array, Cable Length: 71.5cm, Touch User Controls: Call/answer end; Mute; Volume +/-; Programmable function button, Battery type: Rechargeable Li-ion, Battery life: Up to 20 hours (talk time)