The Voyager Stereo 4220 UC Headset from Plantronics. Featuring a stereo design and a flexible noise-canceling boom microphone, the Plantronics Voyager 4220 UC Headset comes with a USB Type-C Bluetooth adapter for connecting to your smartphone or Mac or Windows PC.With up to 12 hours of talk time, 15 hours of listening time, and a range up to 98' when connected to Bluetooth Class 1 devices, the Plantronics Voyager 4220 UC Headset features a dedicated mute button, as well as voice alerts for mute status, remaining talk time, and connection status. A red indicator light on the outside of the speaker lets others know that you're on a call, while a dynamic mute alert sounds if you talk while the Plantronics Voyager 4220 UC Headset microphone is muted. The headset has been optimized for universal communication apps and softphones from Avaya, Cisco, Microsoft, and others, and it has been certified for Microsoft Skype for Business.SoundGuard DIGITAL technology helps protect against sound levels above 118 dBA, while an anti-startle feature is designed to detect and eliminate a sudden increase in signal level during calls. Time-weighted average helps to prevent average daily noise exposure from exceeding 85 dBA.The Plantronics Voyager 4220 UC Headset features two microphones: one with a uni-directional pickup pattern, and another with a MEMS (microelectromechanical systems)-directional design.