Poly CS540 (7W073AA) DECT Wireless Headset System (formerly Plantronics CS540) New, factory sealed. Convertible wearing styles (over-ear, over-head, behind-head) | DECT wireless — 350ft range | Wideband audio | One-touch call answer/end | Up to 7 hours talk time | Conference up to 3 additional headsets | Compatible with most desk phones
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