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
Replacement Connect Utility Wireless Receiver for Logitech V450 Laser Mouse Ku | eBay
Logitech Unifying Receiver for Connecting Multiple Devices