How to Remove and Uninstall Logitech Unifying Software
FreeKB - Logitech Resolve "There is no Unifying receiver plugged into your computer"
hardware - Is Logitech's Unifying receiver supported? - Ask Ubuntu
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
Download Logitech Unifying Software for Mac | MacUpdate