- Usb-C To Rj9 Adapter Enables The Use Of A Wired Rj9 Telephone Handset Or Headset With A Type-C Device For Calls And Videoconferences - Extend The Life Of Existing Landline Hardware; Compatible With Laptop Or Desktop Computer And Mobile Device - Plug-And-Play On Windows/Macos/Android/Ios/Ipados - Compatible With Sennheiser/Epos Ui760 And Plantronics/Poly Vista M22 Headset/Phone Amplifiers - 6Ft (1.8M) Cable Allows Flexible Routing And Freedom Of Movement During Calls Or Videoconferences