Voyager 4320 MS Bluetooth® Earpiece that’s as professional and versatile as you. Voyager 4320 MS is wireless binaural headset that features noise-cancelling dual-mic with Acoustic Fence technology and Bluetooth earpiece that connect directly to a mobile phone via Bluetooth & come with a USB dongle to connect to PC, Mac, or laptop with integrated call control on the earphone with a mute button on the microphone boom for your total convenience. The dynamic mute alert also notifies you when you talk with the microphone muted and the on-call indicator alerts the people around you when you are working and need to focus. The Poly Voyager 4320 UC Microsoft Teams Certified also has a dedicated Microsoft Teams button. Supports Bluetooth 5.2 — up to 164 ft wireless range with up to a full 24 hours of wireless talk time and listening time of up to 47 hours.