This is the Jabra BIZ 2400 II Mono/Convertible 3-in-1 USB MS PC headset, Microsoft Teams Certified.  It comes with additonal attachements to wear over the ear and behind the neck. Jabra BIZ 2400 II MS USB 3-in-1 headsets are designed for business and using VoIP softphones such as Microsoft Teams.  Neodymium speakers provide wide band audio, resulting in best audio quality, and all-around better customer service results. Advance noise canceling mic background office noise. Compatible with almost all majorUC softphones on both Windows and Mac OS.  

Key Features:

• MS Teams Certified Plug and Play
• Wide-band audio — from 80-16,000 Hz frequency
• Advance noise-cancelling microphone
• 3 wearing options. an ear hook and behind the neck band as well as the over-the-head headband.
• Convenient control pad — user can answer and end phone calls simply by clicking call control buttons. Two buttons can be programmed from the computer to perform user-defined tasks such as “answer mobile phone call”, “speak mute”
• Compatible with both PCs and Mac. USB Drivers for most soft phones can be download here 
• Gold-plated slider contacts and 360-degree plus rotation boom mic
• PeakStop technology — protects users against acoustic shock which can result in hearing damage.
• 2496-823-309
• 3 year Jabra Warranty

For more information, see Jabra Biz 2400 II USB datasheet