Amazon.com: New Logitech Unifying USB Receiver for Mouse MX M905 M950 M505 M510 M525 M305 M310 M315 M325 M345 M705 M215 : Electronics
Amazon.com: Logitech C-U0007 Unifying Receiver for Mouse and Keyboard Works with Any Logitech Product That Display The Unifying Logo (Orange Star, Connects up to 6 Devices) (C-U0007) : Electronics
Logitech Unifying USB Receiver for Wireless Mouse and Keyboard 2763867 97855133991 | eBay
How to pair more than one device with a Logitech receiver
Logitech Unifying Receiver for Connecting Multiple Devices
Genuine Tiny Unifying USB Receiver Dongle for Logitech Mouse and Keyboard Can Connect Up To Six (6) Devices w/ Unifying Logo - AliExpress