scary. >> reporter: long beach, california. the man walks up to the car and using a small box opens it. right next to him, another man, also using a box opens that car. the problem, they're thieves. no keys. now they've swiped all valuables from the cars. in chicago, exact same scenario. a 3457b by the see dan unlocks it, no key. alarm disabled by some mystery device. >> you feel you've been outsmarted. >> reporter: the same thing happened to steven doi. his car's computers system was hacked. the crook didn't get away clean. his dash cam caught the suspect, pacing, holding some mystery box. >> sure enough in the video you can hear the door locks. >> reporter: in just 18 seconds the crook emptied out $18,000