Amazon.com: Logitech Unifying Receiver, 2.4 GHz Wireless Technology, USB Plug Compatible with all Logitech Unifying Devices like Wireless Mouse and Keyboard, PC / Mac / Laptop - Black
Logitech Unifying receiver - Wikipedia
Wireless Receiver Setup for Keyboard | Logitech Support
Logitech LOST wireless receiver replacement 2018-2019 | how to fix logitech mouse and keybord - YouTube
Logitech MX Keys Mini Wireless Keyboard & Logi Bolt USB Receiver