Logitech MK235 Durable Wireless Keyboard and Mouse Combo
List of Logitech products - Wikiwand
Zone Wireless Plus Unifying + Audio Receiver
How to pair more than one device with a Logitech receiver
Logitech Wireless Keyboard and Mouse Combo MK270 - 2.4GHz, Unifying Nano Receiver, Extended Battery Life
Logitech's USB Unifying Receiver: one dongle to serve multiple input peripherals | Engadget
Amazon.co.jp: Logitech MK295GP Wireless Mouse and Keyboard Set, Quiet, Waterproof, Wireless, USB Connection, Not Compatible with Unifying, Graphite, Authentic Japanese Product : Computers
How to Connect a Logitech Wireless Mouse to a Unifying Receiver