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
Lost Dongle of Wireless Mouse & Keyboard Logitech? (Different Replacement Logitech Usb Receiver) - YouTube
Logitech G613 (920008386) Wireless Keyboard (Missing the USB receiver) 97855135285 | eBay