How to pair more than one device with a Logitech 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
Logitech MX Keys Mini - keyboard - pale gray - 920-010473 - Keyboards - CDW.com
Amazon.com: New Logitech Unifying USB Receiver for Mouse MX M905 M950 M505 M510 M525 M305 M310 M315 M325 M345 M705 M215 : Electronics
Logitech Unifying Receiver for Connecting Multiple Devices
Logitech USB Unifying Wireless Receiver (910-005235) - Walmart.com