The completely counter-intuitive way of deleting a device from Logitech Options | ZDNet
Logitech Anywhere 2 Wireless Mouse SETUP GUIDE
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Logitech Unifying Receiver for Connecting Multiple Devices
Genuine Tiny Unifying USB Receiver Dongle for Logitech Mouse and Keyboard Can Connect Up To Six (6) Devices w/ Unifying Logo|usb mouse and keyboard|logitech usb keyboardusb mouse keyboard - AliExpress
Ask a Swiss: How to connect a non-Unifying Logitech keyboard & mouse to a new dongle