Addasound Crystal 2821 Monaural (single-ear) headset is top-of-the-line model that offers Blending luxurious comfort with superior audio clarity and sleek, polished looks, the Addasound Crystal 2821 Mono headset delivers style and performance to office and call center workers. Premium lightweight materials and leatherette ear pads provide all-day comfort. A precision-fit, noise-canceling microphone and wideband response ensure crystal-clear customer communications. Mitel IP Series, Models 5000 IP, 5010, 5020, 5020i, 5040i, 5050, 5055 IP, 5055 SIP, 5140, 5201, 5207 IP, 5210 IP, 5212, 5215, 5220, 5224, 5230, 5235, 5240, 5550 IP DKT-3001, DKT-3010S, DKT-3014SDL, DKT-3020S, DKT-3020SD( MUST HAVE TOSHIBA’BHEU ADAPTER for on hook answering, sold by Toshiba, not available from us) Buyer is resp.
eBay