Every Adult needs a PKE from the Classic Ghostbusters to Hunt Ghosts and Ghouls this season The Psycho-Kinetic Energy Meter Features bight lights, sounds and retractable antennae that fold in and out. When activated a Green glow moves across the screen indicating a paranormal presence is nearby. 2 Activation modes gives the choice of a constant on or short on cycle. The costume accessory runs on 3 AAA Batteries for long lasting fun that doesn't die fast. Quickly Amp-up your Ghostbusters Costume with a finishing touch that will set off sparks with friends and family!