This Headset Connects directly to a 2.5mm headset port on most basic and business phones such as Polycom Cisco Linksys SPA, Panasonic Zultys AT&T Aastra GrandStream and many cordless DECT phones with standard 2.5mm Headset Jack.

Works for Phones: DO NOT BUY IF YOU CAN NOT FIND YOUR PHONE MODEL IN LIST
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 Corded Telephone Headset Mono with Noise Canceling Mic and Volume Mute Control for Cisco Linksys SPA SPA921 SPA922 SPA941 303 501G 502G 504G and Cordless Dect Phones with 2.5mm Jack(510P2J25)

• Only works for some specific phones with 2.5mm standard headset Port. SEE COMPATIBLE PHONE LIST IN DESCRIPTION, BUY THE ITEM ONLY IF YOU HAVE ONE OF THE PHONE MODELS LISTED BELOW.
• 2.5mm Jack Direct connect headband telephone headset headphone, No additional amplifiers or adapters required.
• Superior Call Center quality sound headset with flexible adjustable noise canceling microphone.
• Super Lightweight, Super Durable Headset with Comfortable ear and mic cushions for all day use.
• With Mic Mute / Volume Control built in.

Only works for some specific phones with 2.5mm standard headset Port. SEE COMPATIBLE PHONE LIST IN DESCRIPTION, BUY THE ITEM ONLY IF YOU HAVE ONE OF THE PHONE MODELS LISTED BELOW.Wantek