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Logitech K520 wireless keyboard (no USB receiver Or Mouse) | eBay
Logitech K520 Wireless Keyboard (NO RECEIVER) (IL/920-002553KB-MP-UG) | eBay
List of Logitech products - Wikipedia
Unifying Receiver for Mouse and Keyboard Compatible for Any Logitech Product That Display The Unifying Logo (Orange Star, Connects up to 6 Devices) : Electronics