Joy Buzzer is a trinket in Fiend Folio: RELOADED, a mod for The Binding of Isaac.

Replaces all Lil' Batteries with Firework Batteries, Virtuous Batteries or Cursed Batteries.

Grants a 50% chance to replace cards in Shops with batteries.

The following special synergies and interactions for Joy Buzzer have been documented.

* Note that not all possible synergies and interactions are listed here.

• Check out the trinket description on the mod's external Wiki.
• Download Fiend Folio: RELOADED from the Steam Workshop.