IF YOUR PHONE IS NOT ON THE LIST, PLEASE CONTACT US TO CHECK THE COMPATIBILITY. Interquartz IQ260 IQ330 IQ331 IQ333 IQ333D IQ333EHS IQ360 IQ560E IQ750 *Compatible with POLY H series Headset. [COMPATIBILITY] U10 Bottom Adapter with RJ09 is compatible with CISCO IP 6921 6941 6945 6961 7931G 7940 7940G 7941 7941G 7942G 7945 7945G 7960 7960G 7961 7961G 7965G 7970 7970G 7971G 7975G 8941 8945 8961 9951 9971. [Features] Slim and flexible microphone boom arm with 120 degree bended for the best position to the mouth. Ergonomic curved headbands for comfort wearing with smooth click stop for adjustment and strong connection between headband and speaker body. Luxury metal cap not to insert any hair when adjusting the headband. [All day Comfort] Very comfort, endurable and smart designed for office, contact center and home workers. Premium protein leatherette cushions is included. [WARRANTY] 3 years after purchased date. [ASP Circuit] Acoustic shock protection circuit on the speaker protect you 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. [WIDEBAND AUDIO & NOISE CANCELLING MICROPHONE] IPD IPH-250 Single Ear wired phone headset has a HD Wideband speaker to be clear sound and passive noise cancelling microphone make clearer conversation by reducing background noise.