How to pair more than one device with a Logitech receiver
Zone Wireless Plus Unifying + Audio Receiver
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: New Logitech Unifying USB Receiver for keyboard K230 K250 K270 K320 K340 K350 K750 K800 : Electronics
Amazon.com: New Logitech Unifying USB Receiver for Mouse MX M905 M950 M505 M510 M525 M305 M310 M315 M325 M345 M705 M215 : Electronics
Brand new - Logitech Unifying Receiver for keyboard & mouse | eBay
Logitech Unifying Wireless Solar Keyboard K750 K800 K520 Dongle USB Receiver | eBay
How to Connect a Logitech Wireless Mouse to a Unifying Receiver
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
Wireless Dongle Receiver Unifying Usb Adapter For Logitech Mouse Keyboard Connect 6 Device For Mx M905 M950 M505 M510 M525 Etc - Mice & Keyboards Accessories - AliExpress
Genuine Tiny Unifying Usb Receiver Dongle For Logitech Mouse And Keyboard Can Connect Up To Six (6) Devices W/ Unifying Logo - Keyboards - AliExpress