Amazon.com: 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 : Electronics
Amazon.com: Logitech 920003051 K270 Wireless Keyboard, USB Unifying Receiver, Black : Electronics
Logitech MK235 Durable Wireless Keyboard and Mouse Combo
Logitech Unifying Receiver for Connecting Multiple Devices
Best wireless keyboards 2023: Top Bluetooth and USB models reviewed | PCWorld