See Compatible Phone in Description:direct connect over the head landline telephone headsets with microphone compatible with avaya aastra allworx adtran alcatel lucent altiGen comdial digium gigaset Intertel plantronics mivoice. mitel | High Sound Quality for Clear Communication: Wideband Sound phone headsets for Office phones enables natural listening experience, features Noise Canceling Microphone to reduce background noise, Acoustic Shock Protection Circuit to protect your hearing. | Most Comfortable Headset: Super lightweight Corded office phone headset RJ9 with adjustable headband to fit all head sizes, high quality and soft leatherette ear cushion enhance all-day wearing comfort. Professional Mic Mute / Volume Control built in. | Super Durable: Precision design, quality plastics, unibody headband construction, superior quality microphone makes this call center headset for landline phone sturdier and more durable. Compete with Plantronics or Jabra heavy duty Phone Headsets for Call Center, Telemarketing & Office. | 30-DAYS MONEY BACK GUARANTEE :ONLY COMPATIBLE WITH SOME SPECIFIC PHONE MODELS LISTED IN DESCRIPTION. For Other Phones, Pls CONTACT US for Compatibility Guide or Advice. RJ9 Telephone Headset for AVAYA: 6402D 6408D+ 6416D+M 6424D+M 8403 8410D 8434DX 4406D+ 4412D+ 4424D+ 4424LD+ 1120 1140 1165 1210 1220 1230 1408 1416 3904 3905 7208 7316 9404 9406 9408 9504 9508 2410 2420 5410 5420 5610 5620 5621 5625 DT1 DT3 DT5 QE4610 4610 4612 4620 4621 4622 4625 4630.