[There's a basic note that gives instruction that the 'power' activates upon the user 'willing' it to do so, including the details of the power as well as the name of the item:

Blue Flower Necklace - Can heal about a good amount of someone's wounds (30%) when someone gets hurt enough, five times.

There is also a personal note sent along that reads:

"Haruka,

I understand you may be at a disadvantage compared to the others. Allow me to use whatever power I have to bestow a small blessing upon you. Put this on and do not remove it. The necklace shall aid you in thwarting what lies ahead."

It is signed with a doodle of a tall triangle with a circle in it, drawn in blue ink.]