Poly CS540A Wireless Over-the-head, Over-the-ear, Behind-the-head Mono Earset - Black

Poly CS540A Wireless Over-the-head, Over-the-ear, Behind-the-head Mono Earset - Black - Monaural - In-ear - 12000 cm - DECT - Noise Cancelling Microphone

User Manual
Product Brochure