Hairpin

Hairpin is an unlockable trinket added in The Binding of Isaac: Afterbirth †.

Effects

 * Fully recharges Isaac's active item upon entering a boss fight.
 * This effect only occurs the first time a Boss Room is entered; leaving and re-entering the Boss Room will not result in more recharges.

Interactions

 * : If the item doesn't have a full first charge level, it will be filled. If the first level is full, the second charge level will be filled.
 * : The item will gain both its charges.
 * : Mega Blast gains only 3 charge units.

Trivia

 * Hairpin has been added in Booster Pack, after the initial release of the DLC.
 * Hairpin is based on this Steam Workshop trinket by zarat.us.
 * Hairpin's original description was "Poke that power outlet! Bosses charge you".