Logitech C-UAL52 SecureConnect USB Mini Receiver 831843-0000 with Cradle | eBay
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
Amazon.com: Logitech Unifying Receiver USB Dongle for Logitech M185 Wireless Mouse and Keyboard : Electronics
Logitech Unifying Receiver for Connecting Multiple Devices