Wantek Wired Telephone RJ Headset with Flexible Noise Canceling Mic and Volume Mute Control for Aastra Shoretel Nortel Cisco E20 Polycom Digium Altigen Comdial & Starleaf Office IP Phones(H110B003A) Only works for some specific phones with Standard Modular RJ Headset Port. SEE COMPATIBLE PHONE LIST IN DESCRIPTION, BUY THE ITEM ONLY IF YOU HAVE ONE OF THE PHONE MODELS LISTED BELOW. Direct connect over the head telephone headset, No additional amplifiers or adapters required, Most easy setup headset solution. Superior Call Center quality sound headset with flexible adjustable noise canceling microphone. Super Lightweight, Super Durable Headset with Comfortable ear and mic cushions for all day use. With Mic Mute & Volume Control built in. Compatible with Aastra 2465 2564 480 480e 480i 51i 53i 55i 57i 57iCT 554 564 565 i733 1120e 1140e 1150e 1210 1220 1230 i2002 i2004 i2004 IP i2004 Phase II i2052 7406 8540 9617 6730i 6731i 6739i 6751i 6753i 6755i 6757i 6757i CT 7446i 9112i 9133i 9116 9143i 9480i M2216 (ACD I or ACD II) M3905 M4000 M4020 M7208 M7308 M7310 M7316 M7324 M4000 M4020 M5208 M5209 M5216 M5317 M7900 M8001 M8003 M9009 M9516 Powertouch 480 480e 480i Telephones i2002 i2004 i2004 IP