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
Replacing Your Wireless Mouse / Keyboard Receiver - ComeauSoftware.com
Logitech Wireless Keyboard & Mouse, Black with 33 Foot Range.
Logitech Unifying Receiver for Connecting Multiple Devices
Amazon.com: Logitech Unifying Receiver USB Dongle for Logitech M185 Wireless Mouse and Keyboard : Electronics
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
Connect multiple Logitech wireless devices using same USB receiver
Logitech Wireless Keyboard and Mouse Combo for Windows, 2.4 GHz Wireless, Compact Mouse, 8 Multimedia and Shortcut Keys, 2-Year Battery Life, for PC, Laptop - Walmart.com