Logitech K480 - Mac os X, Ios; Windows 7

Mac OS X, iOS
To connect to an Apple Macintosh, iPhone®, or iPad®:
Press and hold down the “i” connect button for 3 seconds.
The light next to the connect button starts blinking to let you know the keyboard is ready to pair
with another device.
The keyboard remains in “discovery” mode for about 3 minutes.
Windows 7