your car that unlocks the doors and turns off the alarm. and that code changes every time you press the button. reporter: watch this alleged thief in chicago seems to be walking by parked cars, scanning to see if the signal from his device matches any of them. mind-boggling how quickly and how smart they are. reporter: in the u.k., police revealing an average of 17 vehicles a day were stolen by exploiting keyless systems in 2014. manufacturers are trying really hard to make sure they are aware of any current or future exploits. it s a game of cat and mouse and always will be. reporter: to beat these high-tech thieves, use low-tech methods a steering wheel lock, well-lit parking space and double checking no valuables are left in the car. becky worley, abc news, san francisco. simple stuff. simple stuff, right. coming up, the end of an era for our friend oprah winfrey and nearly 200 of her employees in the windy city. you threw that friend in there.