PKE Meter - Ghostbusters ClassicEvery 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