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
Plantronics CS540-CIS Cisco IP Phone Compatible Wireless Headset
Amazon.com: Discover D315 Universal USB Adapter Compatible with Plantronics, Jabra and Sennheiser Wireless DECT Headsets | Allows Your Desk Phone Wireless Headset to Connect to A Computer : Electronics
Plantronics CS540 Wireless Headset Package for Cisco SPA512G, SPA514G. SPA525G, and SPA525G2 IP Phones
EBD Products Compatible Plantronics Battery Replacement For Cs540 And C054 Wireless Headsets