How to pair more than one device with a Logitech receiver
Logitech MX Keys Mini Wireless Keyboard & Logi Bolt USB Receiver
Logitech MX Keys review: A wireless keyboard that does much more | PCWorld
Logitech MX Keys Mini Review - RTINGS.com
Logitech's smaller MX Keys Mini ditches the numpad for other useful keys - The Verge
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