Connecting a Logitech device to your Unifying Receiver (Windows and Mac) - YouTube
Logitech 910-002225 M185 Wireless Mouse - 2.4 GHz, USB Nano Receiver, Plug-and-Play, Optical Sensor, On and Off Switch, Ambidextrous Design, Swift Gray at TigerDirect.com
Logitech Wireless Combo MK260 920-002950 Black 8 Hot Keys USB RF Wireless Standard Keyboard and Mouse - Newegg.com
Amazon.com: Logitech 920003051 K270 Wireless Keyboard, USB Unifying Receiver, Black : Electronics
Amazon.com: Logitech Wireless Combo MK260 with Keyboard and Mouse : Electronics
Ask a Swiss: How to connect a non-Unifying Logitech keyboard & mouse to a new dongle