The description of this USB receiver specifically lists the K270 as connected to a KB pair, but when the application starts it just says 'Pairing Failed' with no useful details. I tried it on 2 different PCs and on different USB ports with the same result. The PC recognizes the USB receiver and the app tries to pair. The Logitech website is primarily sales-oriented and does not contain any useful technical or troubleshooting information. I have returned this device.
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