Buy Plantronics CS540 Wireless Headset (C054a) $240.90 - OfficeLife Australia
PLANTRONICS C054A / HL10 Wireless Headset/Mic with Dock and Charger - £29.99 | PicClick UK
PLANTRONICS CS540 A WIRELESS HEADSET & USB Charger | eBay
3 Simple Steps To Mute the Microphone On Your Plantronics CS540 Wireless Headset – Merrittcomm Blog | Wired & Wireless Headsets, Productivity, Efficiency