Solved: XPS8940 Logitech Unifying USB receiver cannot be detected - Page 2 - Dell Community
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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
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Ask a Swiss: How to connect a non-Unifying Logitech keyboard & mouse to a new dongle