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We offer 30 days money back & 24-month worry-free guarantee for our all phone headset. 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. Only works for phones with 2.5mm headset jack. DO NOT BUY IF YOU CAN NOT FIND YOUR PHONE MODEL IN LIST. Works for Phones: Cisco Linksys: CIT200, CIT300, CIT310, CIT400, SPA921, SPA922, SPA941, SPA942, SPA962 models Cisco: 7985 IP phones Cisco SPA: 303, 501G, 502G, 504G, 508G, 509G, 525G 512G 514G,525G2 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-T 7603, KX-T 7625, KX-T 7630, KX-T7633, KX-T 7636, KX-T 7730, KX-T 7735 Gigaset:C610 IP, C620H Zultys Technologies: ZIP 4x4, ZIP 4x5 IP Phones Wantek Dual Ear Call Center Telephone Headset with Mic + Volume Mute Controls for Cisco Linksys SPA 303 504G 508G 942 Grandstream Polycom Panasonic AT&T TL88002 with 2.5mm Headphone Jack(H120S04J25)