Mouse Keyboard Wireless Dongle Receiver Unifying USB Adapter for logitech-MX M905 M950 M505 M510 Connect 6 Device - AliExpress
Logitech MK520 Wireless Keyboard Mouse Combo with Unifying
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
Logitech K520 Wireless Keyboard With Unifying Receiver Dongle | eBay