Why you should really, really update your Logitech wireless dongle - The Verge
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Logitech Unifying receiver - Wikipedia
Logitech Unifying Receiver for Connecting Multiple Devices
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Logitech Unifying Receiver for Connecting Multiple Devices
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Logitech MK270 Wireless Combo, Includes Keyboard, Mouse, Nano-Receiver 920-004536
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Ask a Swiss: How to connect a non-Unifying Logitech keyboard & mouse to a new dongle