Savi W445-M Convertible (Microsoft) (20349-01) Plantronics Savi W445-M USB wireless headset for Microsoft Lync 2010, and Skype only. The unlimited talk time, and range with DECT (1.9ghz) technology provides better audio. It's design so you can talk without ever running out of battery. W445-M comes complete with an extra battery and deluxe charger kit roam up to 300 feet from your PC. W445-M is the lightest headset on the market (weighs only 0.7 oz). Receive sound guard technology limiting audio spike. One-touch call answer/end, vol +/-, mute and flash for smarter call management. Feature currently for Microsoft Lync, and Skype only.