Logitech SLIM FOLIO Guide De Setup page 7

Status light indicators
Your keyboard case's status light provides information about the battery power
and Bluetooth connection:
Light
Green
Red
Blinking blue
Solid blue
Description
The batteries have adequate charge.
Battery power is low (less than 10%). Replace the batteries.
Fast: The keyboard is in discovery mode, ready for pairing.
Slow: The keyboard is trying to reconnect to your iPad.
Bluetooth pairing or reconnection is successful.
English 7