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Logitech M505 user manual (English - 2 pages)
Amazon.com: Logitech C-U0007 Unifying Receiver for Mouse and Keyboard Works with Any Logitech Product That Display The Unifying Logo (Orange Star, Connects up to 6 Devices) (C-U0007) : Electronics
How to Pair logitech Mouse/Keyboard with Other non-Unifying Receiver (for PC) - YouTube