Amazon.com: Logitech 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
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Logitech Unifying Receiver for Connecting Multiple Devices
Logitech Unifying Vs Non-Unifying Receiver (software in description) - YouTube
Logitech Unifying Receiver for Connecting Multiple Devices