PolyCS540 Wireless DECT Headset (Plantronics) – Single Ear (Mono) Convertible (3 wearing styles) – Connects to Desk Phone – Noise Canceling Microphone – Amazon Exclusive

Poly CS540 Wireless DECT Headset (Plantronics) – Single Ear (Mono) Convertible (3 wearing styles) – Connects to Desk Phone – Noise Canceling Microphone – Amazon Exclusive

Plantronics 38350-13 APC-43 Electronic Hook Switch Adapter, Black

Plantronics - APC-43 EHS Cable for CS500 series