New in Box Plantronics CS540 DECT 6.0 Converible Wireless Telephone Headset System. Black. Model/part number 84693-01. Connects to desk phone, cable included. Hands free. Lightweight, single earpiece, wear over ear or over head. Also has behind the head wearing option but neckband is sold separately. Noise canceling microphone keeps background noise out of your call. Up to 7 hours talk time per charge. Call control, volume control and touch control. Wireless range up to 400 feet.