Plantronics 84606-01 behind-the-head headband the Plantronics 84606-01 is a behind-the-head headband that allows gives users of compatible headsets a comfortable and extremely lightweight alternative wearing option. The Plantronics 84606-01 is compatible with the follow Plantronics wireless headsets: Plantronics save 400 Series: W440/W440-M and W445/w445-mplantronics cs540plantronics cs540-xdplantronics save 400 Series: W740/w740-m