Genuine (Y-R0012) Logitech K520 Keyboard & Mouse (M310) w/ IR Receiver Set *READ 97855066718 | eBay
Logitech K520 wireless keyboard (no USB receiver Or Mouse) | eBay
Logitech K520 Wireless Keyboard (NO RECEIVER) (IL/920-002553KB-MP-UG) | eBay
Logitech MK520 Wireless Keyboard and Mouse Combo - Black | Dell USA
Unifying Receiver for Mouse and Keyboard Compatible for Any Logitech Product That Display The Unifying Logo (Orange Star, Connects up to 6 Devices) : Electronics