Additional Details ------------------------------ Product description: Replacement Handset for Nortel/Avaya/Avaya M3900, T7100, i2000 Series Phones. Our handsets are tested to ensure that they consistently meet original Nortel/Avaya Style specifications. The handsets have a noise reduction feature (noise reducing-not noise canceling), are hearing aid compatible and meet static voltage testing. The colors of our handsets are matched to Nortel/Avaya most recent handset colors. These handsets are brand new (not refurbished), new guts, new plastic...new everything. The handsets are designed to work on the systems listed, but they may function on other systems not listed. These handsets come with a 1 year limited warranty. If used on other systems, warranty is void, and use at your own risk. Compatible with M3901, M3902, M3903, M3904, M3905 T7100, T7208, T7316, T7316E i2001, i2002, i2004, i2007, i2050