Professional Mic Mute / Volume Control built in.

Super Durable and Most Comfort 2.5MM Headset with High Sound Quality.

Compatible List(Part): DO NOT BUY THE ITEM IF YOU CAN'T FIND YOUR PHONE MODEL IN LISTS, CONTACT US FOR ADVICE.

Cisco Linksys: CIT200, CIT300, CIT310, CIT400 SPA921, SPA922, SPA941, SPA942, SPA962
Cisco SPA: 303, 501G, 502G, 504G, 508G, 509G, 525G 512G 514G,525G2
Cisco: 7985 Unified IP phones
Polycom: IP320, IP321, IP330, IP331, SoundPoint Pro SE-220 SE-225
Grandstream:GXP-2010, GXP-2020, GXP-2100, GXP-2110, GXP-2120, GXP-280, GXP-285,BT200, BT201 GXP-2000(Version 1.0 higher with 2.5mm Headset Socket) 
Panasonic: KX-NT136, KX-NT343, KX-NT346, KX-NT366 ,KX-T7603, KX-T7625, KX-T7630, KX-T7633, KX-T7636, KX-T7730, KX-T7735
Gigaset: C610 IP, C620H
Zultys Technologies: ZIP 4x4, ZIP 4x5 IP Phones

Plus Many Many Cordless Phones with standard 2.5mm Headset jack from brands below:
Uniden ClearSounds EnGenius Thomson Vtech Audioline Toshiba Ameriphone Sanyo Philips Teledex Novelty Phones Aria Southwestern Bell Karcher Serene Innovations Aastra Telecom Siemens Bellsouth Vodavi Cortelco Ameritech Sharp LogicMark CLEAR SOUNDS Muraphone Midland Verizon SBC NEC IBM Motorola Coby Electronics GE Pacific Bell Sylvania Binatone Conair Lenmar RCA MCE ITT Clarity 5.8GHz 900MHz 

Wantek 2.5mm Telephone Headset Dual with Noise Canceling Mic + Volume Mute Control for Panasonic Grandstream Polycom Gigaset Cisco Linksys SPA Zultys Office IP and Cordless Dect Phones(602J25D)

• High Sound Quality for Clear Communication: Wideband Sound telephone headset 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 office telephone 2.5mm headset with adjustable headband to fit all head sizes, high quality and soft leatherette ear cushion enhance all-day wearing comfort.
• Super Durable: Precision design, quality plastics, unibody headband construction, superior quality microphone makes this call center headset sturdier and more durable. Compete with Plantronics or Jabra heavy duty 2.5mm Headsets for Call Center, Telemarketing, Office & Cordless DECT Phones.
• 2.5MM HEADSET: Compatible with Cisco Linksys SPA Polycom Grandstream Panasonic Zultys Gigaset Office IP, most Cordless Dect Phones and some old cell phones with standard 2.5MM HEADSET JACK.
• ONLY COMPATIBLE WITH SOME SPECIFIC PHONE MODELS LISTED IN DESCRIPTION. Buy the item today if you have one of phone models in list. For other phones, pls contact us for Compatibility Guide or Advice.

High Sound Quality for Clear Communication: Wideband Sound telephone headset enables natural listening experience, features Noise Canceling Microphone to reduce background noise, Acoustic Shock Protection Circuit to protect your hearing.Wantek