New Usb Receiver Wireless Dongle Receiver Usb Adapter For Logitech Mk270/mk260/mk220/mk345/mk240/m275/m210/m212/m150 Keyboard - Keyboard Mouse Combos - AliExpress
Replacing Your Wireless Mouse / Keyboard Receiver - ComeauSoftware.com
Logitech Unifying Receiver for Connecting Multiple Devices
Wireless Dongle Receiver Unifying USB Adapter for logitech Mouse Keyboard Connect 6 Device for MX M905 M510 Keyboard K400|Wireless Adapter| - AliExpress
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
USB Unifying Receiver for Logitech Mouse and Keyboard 73257010740 | eBay