The Batmobile's shields are made of ceramic fractal armor panels. They explode outward when struck by projectiles, deflecting injurious force away from the car and its occupants. If Batman must leave the Batmobile for an extended period of time, he can, through a voice command spoken into a wrist device (specifically, the word "shields"), activate the Batmobile's shielding system. This prevents anyone from tampering with the vehicle while it is left unattended. Bulletproof and fireproof steel armor plates envelop the body and cockpit entirely. While this armor is in place, the vehicle cannot be driven. In "Batman" the shields were not fully functioning. In reality, a life-size model was built, and the shield activation sequence was created with stop motion animation technology. In "Batman Returns", the shields held the same characteristics. However, the design was slimmer and the special effects were provided by computer-generated imagery. In shield mode, a small but powerful bomb can be deployed.