PLANTRONICS CS540 A WIRELESS HEADSET & USB Charger | eBay
Plantronics CS540 wireless phone headset
Amazon.com: Polycom Compatible Plantronics CS540 VoIP Wireless Headset Bundle with Electronic Remote Answer|End and Ring alert (EHS) for IP 335 430 450 550 560 650 670 | VVX 300 310 400 410 500 600 1500 : Office Products
Genuine Plantronics AC Adapter For CS55 CS540 Wireless Headset Charger OEM | eBay
Polycom Compatible Plantronics VoIP Wireless Headset Bundle with Electronic Remote Answerer (EHS) included | SoundPoint® Phones: IP 335, IP 430, IP 450, IP 550, IP 560, IP 650, IP 670, VVX300, VVX500, VVX310, VVX600, VVX400, VVX1500, VVX410