This is the Jabra BIZ 2400 II Mono/Convertible 3-in-1 USB UC computer headset enables employees to connect with computer PC or Apple Mac. Using Jabra Direct software you can easily switch between computer-based (Windows or Mac OS) IP telephony.  It comes with additonal attachements to wear on the ear and behind the neck.

Jabra BIZ 2400 II USB 3-in-1 headsets are designed for business and using VoIP softphones on a PC or Mac. Neodymium speakers provide maximum frequency audio, resulting in maximum call quality, and all-around better customer service results. Advance noise canceling mic background noise. Jabra BIZ 2400 II Mono USB is designed to ensure maximum service life and minimum maintenance costs.  

Key Features:

• Hi-Fi audio quality — operate at 80-16,000 Hz frequency wideband audio.
• 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 
• FreeSpin boom — with gold-plated slider contacts and 360-degree plus rotation
• PeakStop technology — protects users against acoustic shock which can result in hearing damage.
• 3 year Jabra Warranty

For more information, see Jabra Biz 2400 II USB datasheet