IF YOUR PHONE IS NOT ON THE BELOW LIST, PLEASE CONTACT US TO CHECK THE COMPATIBILITY. Compatible with Grandstream GXP-1200 1400 1405 1450 2010 2020 2130 2100 2124 2140 2160 2200,GXV-3240 3275,Tiptel80G 485. [COMPATIBILITY] U10P-S Bottom Adapter with RJ09 is compatible with Yealink SIP-T20X T22X T3X T48S T19P T20X T21P T22X T23G T26P T27G T28P T29G T32G T38G T3X T40P T41G T42G T46G T48G, Snom 760 320 710 370 655 420. [Features] Ergonomic curved headbands for comfort wearing with smooth click stop for adjustment and strong connection between headband and speaker body. [All day Comfort] Light weight, Very comfort, endurable and smart designed for office, contact center and home workers. Softy foam cushions is included. [WARRANTY] 3 years after purchased date. [ASP Circuit] Acoustic shock protection circuit on the speaker protect your hearing from unwanted peak noises on desk phones. Cut over 105dB and keep less 105dB level. [Ready to Use] Quick Disconnect (QD) to RJ9 with IPD Headset allow easy connection to desk phones. Plug and play. [WIDEBAND AUDIO & NOISE CANCELLING MICROPHONE] IPD IPH-165 Professional,Binaural, wired phone headset has a HD Wideband speaker to be clear sound and passive noise cancelling microphone make clearer conversation by reducing background noise.