Why you should really, really update your Logitech wireless dongle - The Verge
Logitech K270 Wireless Keyboard with Unifying Receiver
Logitech USB Unifying Receiver, 2.4 GHz Wireless Technology, USB Plug Compatible with All Logitech Unifying Devices Like Wireless Mouse and Keyboard, PC/Mac/Laptop - Black: Keyboard & Mouse Sets: Amazon.com.au
Logitech USB Unifying Receiver : Amazon.co.uk: Computers & Accessories
3+ tested fixes for Logitech unifying receiver poor range issues
Logitech Unifying Receiver for Connecting Multiple Devices
Logitech Unifying receiver - Wikipedia
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Union Wireless Dongle Receiver Unified Usb Adapter For Logitech Mouse Keyboard Connect 6 Devices For Mx M905 M950 M505 M510 M525 - Mouse - AliExpress
Unifying USB receiver, black technology 2,4 GHZ reliable LOGITECH DUAL connectivity at a distance of up to 10 meters - AliExpress