Filmens skript och novellering är båda överens om att det är någon form av EMP-pulspistol (om än en liten, bärbar version).
PAPARAZZI: Another stiff too old to climb out of his sports car.
PAPARAZZI 2: No, that’s Bruce Wayne! Hey, Wayne, where you been hiding?!
Lenses swing onto Wayne, who pushes a button on his key fob – a pulse. The cameras die. Wayne heads to the door. The Dark Knight Trilogy: The Complete Screenplays
Han använder sig av samma teknik senare. Det beskrivs också som en 'puls'
Batman put a safe distance between themselves and Selina’s attackers before landing the Bat on the empty helipad of a midtown skyscraper. An EMP pulse took out any inconvenient lights and security cameras, ensuring their privacy for the moment. - The Dark Knight Rises- The Official Movie Novelization