Poly Plantronics CS540 Wireless Headset (8J8V4AA#ABB) – DECT Convertible Office Headset System. Part Number: 8J8V4AA#ABB (also known as 84693-01 / 7W073AA#ABA). The CS540 is sold under multiple part numbers: 84693-01 (original Plantronics), 7W073AA#ABA (HP/Poly US), and 8J8V4AA#ABB (HP/Poly).
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