Model: OVHS072-P1. OvisLink Monaural call center headset services you with all-day comfort and superior sound quality. It is designed for call center and office phones. With its lightweight over-the-head single leatherette earpiece design, you may wear it all day and feel comfortable. Its noise-canceling microphone reduces surrounding background noise while giving you crystal clear phone calls. The microphone boom can be rotate for placement on either the left or the right ear. Headset size can be adjusted base on size of the head. It comes with a tangle-free coiled cord and shirt clip. RJ9 (RJ22) Quick disconnect cord gives the user convenience. DIRECT CONNECT TO TELEPHONE HEADSET JACK, NO AMPLIFIER is needed! Compatible with: AASTRA, Altigen (AT510, IP-600 & IP705, IP-710), Allworx, Avaya (not include 9xxx series), NEC, Nortel, Meridian, Norstar, PolyCom, Samsung, ShoreTel and Talkswitch telephones with RJ9 headset jack. (*** Not compatible models: Avaya Callmaster, Avaya models 96xx. Polycom Soundpoint IP phones with 2.5mm headset jack. Please browse OvisLink store front to find the compatible headset model for your phone.)