Plantronics Savi W710-M , Microsoft Office Communicator 2007/Lync 2010 compatible wireless headset system.  This is a wireless headset system that connects to multiple devices but allows you to manage all calls from a single headset. This system unifies communication between your PC, desk phone and now mobile phone calls. Users can also listen to any PC-based audio including music players, streaming audio and video, webinars and podcasts with Plantronics W710-M. The headset system features a noise-canceling microphone, wideband audio support, and DECT wireless technology, providing lifelike voice fidelity and the ability to roam up to 350 feet from the base. Retail Price $379.95

Key Features:

• Optimized for Microsoft Office Communicator 2007/Lync. supporting one-touch call control with Office Communicator.
• Over the head Monaural Style Headset
• Multitask, hands-free up to 300 feet from your PC or Laptop
• DECT 6.0, Bluetooth v2.1 technology eliminates interference Wi-Fi networks
• Noise canceling microphone filters out background noise
• 9 hours of talk time
• Headset controls lets you answer/end/mute calls from any connected device up to 350ft away (requires a Plantronics HL10 lifter, sold separately)
• Conference call with up to 3 additional headset users. Or audio can be mixed between any two phones to instantly bring people together.
• Digital Signal Processing provides more natural voice sound
• Advanced wideband audio using CAT iq technology

For more information, see Plantronics Savi W710 datasheet and W710 user manual

Plantronics W710, W720 Charging Cradle/Base