The Plantronics W420 Savi-M is an Over-the-Head Bnaural Headset that connects to PCs and Macs via a USB adapter.
This headset is optimised for Microsoft Lync (Skype for Business).
If not using Skype for Business, use the standard version: the Plantronics W420 Savi.
This headset has a Monaural version: the Plantronics W410-M Savi.
For a headset that fits Over-the-Ear, the Plantronics W430-M Savi is more suitable.
For a version of the W400 series that offers 3 different wearing styles, the Plantronics W440-M Savi is more suitable.