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Sound Professionals SP-CORDLESS-TELEPHONE-TAP - Adapter to record both sides of a conversation using a cordless telephone with 2.5mm headset jack SP-CORDLESS-TELEPHONE-TAP
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VTech DS6671-3 DECT 6.0 Expandable Cordless Phone with Bluetooth Connect to Cell and Answering System, Silver/Black with 2 Handsets and 1 Cordless Headset - Walmart.com
Gigaset C575A Cordless Phone with Wireless Headset - liGo.co.uk