What do the LEDs in the inside of the case signify? (not posting as it’s a duplicate)

When you open the portable charging case, the four white LEDs inside the case indicate the charging power left in the case. If none of the four LEDs above the Here One logo turn on when you open the case, the case is out of power and should be recharged.

All LEDs inside the case will turn off after about 2 seconds of opening the case.