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
Logitech Performance MX
Logitech's Unifying-equipped Performance Mouse MX and Anywhere Mouse MX track on glass | Engadget
Logitech Unifying USB Receiver for Performance Mouse MX - Newegg.com