How to pair more than one device with a Logitech receiver
How to Pair Logitech Mouse /Keyboard with Unifying Receiver - YouTube
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Why you should really, really update your Logitech wireless dongle - The Verge
How to Connect Logitech Wireless Mouse to Unifying Receiver
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How to Pair logitech Mouse/Keyboard with Other non-Unifying Receiver (for PC) - YouTube
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