What can someone do if they've lost the wireless USB connector to their Logitech keyboard and mouse? - Quora
Logitech Unifying Receiver for Connecting Multiple Devices
The Logitech G900 is my favorite mouse even though I lost the wireless adapter - The Verge
No more lost Logitech keyboard receivers!!! - YouTube
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