A motion-activated security system was an alarm found in automobiles on Earth in the 20th and 21st centuries and was designed to keep carjackers from stealing them by emitting a loud noise.

Upon time traveling to 2004 Detroit, Michigan from 2153, Jonathan Archer and T'Pol were looking for suitable transportation to aid in their search for Xindi-Reptilians who were building a bio-weapon in the city. Archer detected two vehicles with motion-activated security systems with his scanner, as well as another with a tire lock. He and T'Pol then stole a Dodge Ram truck. (ENT: "Carpenter Street")

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