SummitLink Unifying Receiver for Mouse and Keyboard Compatible for Any Logitech Product That Display The Unifying Logo (Orange Star, Connects up to 6 Devices) – Sunstar Alliance
How to Install/Pair Logitech Unifying Receiver WIndows/MAC - YouTube
Go Wired or Wireless - Logitech K800 Keyboard Review
LOGITECH K800: Wireless keyboard — USB — black — illuminated at reichelt elektronik