Brand new - Logitech Unifying Receiver for keyboard & mouse | eBay
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 : Electronics
Brand new - Logitech Unifying Receiver for keyboard & mouse | eBay
Logitech MX Anywhere 2S Wireless Mouse with 4000DPI Easy-Switch™ Technology Unifying Receiver for Windows Mac OS iPad OS _ - AliExpress Mobile
Amazon.com: Logitech 920003051 K270 Wireless Keyboard, USB Unifying Receiver, Black : Electronics
Review: Logitech's CRAFT Wireless Keyboard is Pricey, but the Input Dial Is a Useful Addition - MacRumors