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
Is Logitech Unifying Receiver Not Working? Full Fixes for You!
Logitech adds Unifying Receiver to the new Wireless Trackball M570 - CNET
Logitech New Unifying USB Receiver for Mouse Keyboard M515 M570 M600 N305 MK330 MK520 MK710 MK605 - Walmart.com