Poly Savi 8245 UC USB-A wireless convertible headset with unlimited talk time. Comes complete with an extra battery so you can talk non-stop forever.  Poly Savi 8245 is one of the lightest headset on the market. A hot swappable battery for unlimited talk time.  You can walk up to 300 feet away of wireless range. Three different wearing styles (over-the-head, over-the-ear, behind the neck) for your personal taste. Retail $359.95

Key Features:

• Unlimited talk time with hot swappable battery (included)
• D200 USB-A adapter included
• Compatible with UC softphones from Avaya, Cisco, IBM, Skype and more
• DECT 6.0 technology provides better audio; eliminates interference from Wi-Fi networks
• Wide band HD sound
• Noise-canceling mic
• light weight (only 21g)
• 3 wearing styles (all included):
  • Over-the-ear, discrete and stylish
  • Over-the-head, for enhanced stability
  • Behind-the-head, ultra-discreet without sacrificing stability
• 590 feet range from your PC, line of sight. (200ft in a typical office)
• Call control from the headset: answer/end, vol+/-, mute and flash, switch between softphones.
• With Plantronics software get the added value of:
  • Headset answer/end/mute control and automatic presence updates across multiple softphones
  • Battery meter conveniently displays headset battery life remaining in PC icon tray
  • Headset control panel allows for customization of settings, including call notification and related options
• Protection against audio spikes
• Conference up to 3 additional Savi headsets for improved call efficiency
• 211203-01

For more information, see Plantronics Savi 8245 UC datasheet