SUNDELY Call Center Telephone/IP Phone Headset with Adjustable Boom Mic & Screw Cable for Audiovox Cisco Linksys GrandStream Kyocera Qualcomm 2.5mm 1-pin Jack Call Center Customer Service Single Ear Telephone IP Phone Headset Headphone 2.5mm 1-pin Connector, Adjustable Boom Mic Audiovox CDM-130, CDM-1000, CDM-1100, CDM-3000, CDM-4000, CDM-4500, CDM-8400, CDM-8410, CDM-8450, CDM-8455, CDM-8500, CDM-8600, CDM-8615, CDM-8900, CDM-9000, CDM-9950, MVX-401, MVX-405, MVX-406, MVX-425, MVX-430, MVX-435, MVX-440, MVX-450, MVX-460, MVX-465, MVX-470, MVX-475, MVX-480, MVX-485, MVX-500, MVX-501, MVX-502, MVX-505, MVX-506, MVX-507, MVX-525, MVX-530, MVX-535, MVX-550, MVX-560, MVX-565, MVX-605, MVX-650, MVX-700, MVX-750, MVX-800, MVX-850, MVX-855, GSM-810, PCX-3500, TDM-2500 Cisco Linksys CIT200, CIT300, CIT310, CIT400, GrandStream GXP 280, 285, 2000, 2010, 2020 IP Phone version 1.0 or higher Kyocera/Qualcomm QCP 2000, QCP 2035a, QCP 3000, ThinPhone, pdQ SmartPhone 1135, 2027, 2035, 2119, 2135, 2235, 2255, 3035, 3225, 6035, 7135, K7, KE433, kx414, kx433, kx434, s14, SE47