Crystal Clear Calls With Noise Cancelling Microphone and Wideband Sound, this landline phone headset offers truly clear communication for call centers, offices even in noisy environments. Acoustic Shock Protection(ASP) blocks out sudden sound to protect your hearing. Adjustable Headband This RJ9 phone headset with flexible high-quality headband can be adjusted, bent or shaped for different head sizes to relieve the pressure from the headset, allowing you to focus on the calls. No pain and no push to ears for all day wearing. Convenient In-line Controls Easy to access inline controls. Easily adjust the headset volume up and down, mute/unmute the microphone. Just plug the headset into the RJ9 Headset Jack of your landline phone. No additional amplifiers or adapters required. Friendly Notes: This telephone headset ONLY comes with 4-Pin RJ9 jack, NOT comes with 2.5mm jack, 3.5mm jack or USB jack.NOT FOR CELL PHONES OR COMPUTERS. Compatible Phone List(Include but not limited): Polycom: SoundPoint 300 301 335 430 450 500 (rev. E or later) 501 550 560 600 601 650 670 CX300 CX500 CX600 CX700 VVX101 VVX201 VVX301 VVX401 VVX501 VVX601 VVX150 VVX300 VVX310 VVX311 VVX330 VVX400 VVX410 VVX411 VVX500 VVX600 VVX1500 Northern Telecom (Nortel Norstar): 1120E IP 1140E IP 1150E IP i2002 (ip2002) i2004 (ip2004 (not for i2400 phase II and i2004 POE ) 1210 1220 1230 2465 2564 NTZK23AA AB: (M2216):ACDI Vista Powertouch 480 480e 480i M2008 M2216 M2616 M3903 M3904 M3905 M7208 T7208 M7308 M7310 M7316 T7316 T7316E M7324 M7900 M8001 M8003 M9516 M9009 NT8B20 NT8B30 NT8B40 NT8B50 Meridian Option M3110 3310 3820 Avaya / Lucent: 6402D 6408D+ 6416D+M 6424D+M 8403 8410D 8434DX 4406D+ 4412D+ 4424D+ 4424LD+ 1120 1140 1165 1210 1220 1230 1408 1416 2410 2420 4610 4610SW 4612 4620 4620SW 4621 4621SW 4622 4622SW 4625 4625W 4630 4630SW 5402 5410 5420 5610 5620 5621 5625 9404 9406 9408 9504 9508 DT1 DT3 DT5 QE4610 (Not for Avaya: J139 J169 1608 1616 9608G 9611G 9620 9621G 9630 9640 9640G 9641G and 9650 IP Phones) Plantronics: A100 S10 S11 S12 S50 T10 T20 T50 T100 T110 SP-02 SP-04 SP-05 A100 T50 T100 PLX-400 PLX-500 Mitel: 5000 5010 5020 5040 5055 5140 5201 5205 5207 5210 5212 5215 5220 5224 5230 5235 5240 5250 5312 5320 5320e 5324 5330 5330e 5340 5340e 5550 SuperSet 4015 4025 4125 4150 NEC: Aspire Electra Elite IPK Dterm Series i DSX DTL DTP DTR DTU SERIES DT300 DT310 DT330 DT700 DT730 DT750 Dterm Series E DTU-8 DTU-8D DTU-16 DTU-16D DTU-32 DTU-32D DTP-8 DTP-8D DTP-16 DTP-16D DTP-32 DTP-32D DTH-8 DTH-8D DTH-16 DTH-16D DTH-32 DTH-32D Toshiba: DKT-3001 DKT-3010S DKT-3014SDL DKT-3020S DKT-3020SD Strata CIX DP5022F-SD DP5023-SD DP5018-S DP5000-Series ShoreTel: IP100 IP212 212K IP230 IP265 IP530 IP560 560G IP565 IP565G IP655 420 480 480G 485 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 (not compatible with i2400 phase II and i2004 POE phones) Dialog 4222 4223 4224 4225 Siemens or ROLM: Optiset E Series with CA or HA option modules Optiset E Advance Optiset Advance Plus+ Headset Adapter Comfort 300E+ Headset Adapter Comfort F300E Optipoint 410 Standard & Advance Optipoint 420 Standard & Advance Optipoint 500 Basic Standard Standard SL & Advance& office Optipoint 600 Optipoint 600 Office OpenStage 4040TDM 6060TDM 8080TDM Phones ROLM Phones with EHO option Module 612624 Inter-Tel (InterTel): 8520 8560 8600 8620 8660 8662 8690 Allworx: IP 9112 9204 9212 9222 9224 Zultys: ZIP 59i 55i 53i 30is Digium: D40 D45 D50 D70