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Amazon.com: 2.5mm Jack cwith QD Adapter -Compatible for Polycom IP 320,321,330, Cisco SPA,Grandstream GXP,Panasonic KX, Zultys, Gigaset & 2.5mm Headset Jack(3 Poles) Port with Phones. Not Smartphone use. : Electronics
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Amazon.com : Siemens Gigaset Designer Digital Cordless Phone with Color Display, Bluetooth Connectivity and Answering System (SL785) : Cordless Telephones : Office Products