New Logitech Unifying USB Receiver.for.M905.M600.M525.Mouse.&.K350.K750.Keyboard | eBay
Amazon.com: Logitech C-U0007 Unifying Receiver for Mouse and Keyboard Works with Any Logitech Product That Display The Unifying Logo (Orange Star, Connects up to 6 Devices) (C-U0007)
Logitech Wireless Mouse / Keyboard USB Unifying Receiver - Walmart.com
Can I use the Logitech unifying receiver to replace the lost USB for my headset? - Quora