The Jabra M5390 USB is a multiuse Bluetooth headset that allows you to selectively switch between your mobile and PC softphones. It combines the sound and range performance known from office headsets with the convenience of a cell headset. Based on next-generation technology, the M5390 USB offers true wideband audio when used with the A335w USB adapter and a softphone. And the extended wireless range allows users to answer calls up to 200 feet from their desks. For optimum call clarity in loud offices, the M5390 USB's microphone is placed close to the users mouth and features noise-canceling technology. The A335w USB adapter is compliant with a wide range of PC-based softphones including Microsoft® Office Communicator 2007, Cisco Communicator, Skype, and more Enjoy wireless freedom and wideband sound in the office and on the go!