ThinkGeek Annoy-a-tron Prankster Pack 3.0 - Includes 3 ThinkGeek Prank Products: Annoy-a-tron, Ringtone Annoy-a-tron, and Eviltron ANNOY-A-TRON  Periodic beeps and sounds make your friends crazy hunting for that annoying noise RINGTONE ANNOY-A-TRON  Ringing and buzzing will driver friends bonkers looking for the missing phone EVILTRON  Unsettling spooky sound effects scare the daylights out of your friends PRANK PACK 3.0  Redesigned to be louder, more annoying, and more magical. Batteries can be replaced in this new version PLEASE NOTE: After removing the battery tab you may need to push down slightly on the magnet to reseat the battery correctly (you may even hear a small click)