The Jabra M5390 Multiuse headset is a Bluetooth headset that connects simultaneously to mobile phones and desk phones - or to mobile phones and PC softphones (via the enclosed PC dongle).The Jabra M5390 Multiuse headset combines the sound and range performance known from office headsets with the convenience of a mobile headset. Based on next generation Bluetooth technology, it offers true wideband audio when used with the A335w dongle or a soft phone. And the extended wireless range allows users to answer calls up to 70 meters from their desks.The design and wearing style is optimized for office staff, managers and specialists who spend most of their time in the office - and less on the go. For optimum call clarity in loud office environments, the microphone is placed close to the users' mouth and features noise canceling technology. When out of the office, the Jabra M5390 seamlessly connects to the users' mobile phone or PC based softphone.The Jabra M5390 Multiuse base is compatible with most desk phone systems, and the dongle is compliant with a wide range of PC based softphones including, Cisco IP Softphone, Skype etc.