Boo Bell

The Boo Bell is an item that debuted in Mario Party 2. It rarely appears and can only be obtained in an Item Minigame. Its use is to ring for Boo and ask him to steal coins or a star, depending on how much the player can afford. In Mario Party 3, it appears more frequently, as it can be purchased from Koopa Kid.

The Boo Bell is replaced by Boo's Crystal Ball in Mario Party 4.

The item returns in Mario Party: The Top 100, depicted with Boo's face imprinted. Players can use it to steal an opponent's star.

Official description from Mario Party: The Top 100
Boo Bell:

Sends out Boo to fetch one of your rivals' stars.

Names in other languages
Geisterglocke Campana Boo