COMPATIBILITY: Also Compatible with - AVAYA 6402D 6408D+ 6416D+M 6424D+M 8403 8410D 8434DX 4406D+ 4412D+ 4424D+ 4424LD+ 1408 1416 2410 2420 4610 4610SW 4612 4620 4620SW 4621 4621SW 4622 4622SW 4625 4625W 4630 4630SW 5410 5420 5610 5620 5621 5625 9404 9406 9408 9504 9508 DT1 DT3 DT5 QE4610, SHORETEL 100 212 212K IP230 230 265 530 560 560G 565 565G 655 420 480 480G 485 485G Toshiba DKT, Panasonic, ESI, Fanvil, Digium, Adtran, Ascom, Audiocodes, Altigen, Allworx, Comdial, Intertel. COMPATIBILITY: U10P Adapter included is compatible with : POLYCOM / POLY EDGE Series and VVX50 VVX101 VVX150 VVX201 VVX250 VVX300 VVX350 VVX301 VVX310 VVX311 VVX400 VVX401 VVX410 VVX411 VVX450 VVX500 VVX501 VVX600 & VVX601, IP301 IP335 IP331 IP335 IP560 IP550 CX300 CX500 CX600 CX700, 485 and Aastra Models 6757i 6731i 6739i 6755i 6867i 6869i, Nortel T7316 T7316e T7208, Mitel Models 5212 5312 5320 5320e 5330 5330e 5340 5340e 5410 5420 550 5540 6867i 6869i 6910 6920 6930 6940 8528 IP420 IP420G IP480 IP485G. QUICK DISCONNECT FEATURE: Our TruVoice Headset range include a Quick Disconnect Connection, this feature allows customers to detach the headset away from the adapter cable so they can move away from the desk without losing the call. Quick Disconnect headsets also allow the headset user to use the same headset with any other desk phone, Computer, Softphone or Cell Phone by just simply swapping out the bottom cable. The full range of TruVoice adapter cables can be found in our online store. COMFORT / SOUND : Headset Includes Super Soft leatherette ear cushions, foam cushions are available if preferred. Our Speakers include acoustic shock protection and HD Audio Sound. NOISE REDUCTION: Headset includes High Quality Noise Reduction Voice Tube with 270 degree Rotational Microphone Boom - Perfect Solution for quiet offices and homeworkers.