Wireless Dongle Receiver Unifying USB Adapter for logitech Mouse Keyboard Connect 6 Device for MX M905 M510 Keyboard K400 - AliExpress
Amazon.com: Logitech USB Unifying Receiver - 2 Pack For Personal Computer : Electronics
Logitech MK520 Wireless Keyboard Mouse Combo with Unifying
Logitech K520 Wireless keyboard with mouse and Receiver Unifying. Like a New | eBay
Logitech Compact Wireless Mouse, 2.4 GHz with USB Unifying Receiver, Optical Tracking, Magic Night - Walmart.com
Amazon.com: Logitech 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
How to Pair Logitech Mouse /Keyboard with Unifying Receiver - YouTube