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 : Amazon.co.uk: Computers & Accessories
Replacement Unifying Receiver for Logitech Wireless Mouse/Keyboard USB Dongle | eBay
Logitech Unifying receiver for mouse and keyboard - Walmart.com
StarTech.com USB Bluetooth 5.0 Adapter, USB Bluetooth Dongle Receiver for PC/Computer/Laptop/Keyboard/Mouse/Headsets, Range 33ft/10m, EDR (USBA- BLUETOOTH-V5-C2) | www.uk.shi.com