We move to a burglar caught red-handed thanks to technology. A man watched on his cell phone as a man broke into his house. And with a push of a button, able to use the same phone to scream at the... See More
We move to a burglar caught red-handed thanks to technology. A man watched on his cell phone as a man broke into his house. And with a push of a button, able to use the same phone to scream at the cook, through speakers installed in the house. Reena ninan explains it all. Reporter: What you're about to see is an alleged home invasi invasion, with an unexpected twist. Watch as the alleged burglar slides open the unlooked sliding glass door. He turns around a surveillance camera. What he doesn't know, two other cameras are still rolling, detecting every motion he makes. It was the real thing. And it happened to me. Reporter: 29-year-old nisarg was eating dinner nearby, when he says his dropcam security htemÃ±r sent an alert to his smartphone, telling him his sliding door had been opened. It's pitch dark. But these cameras have night vision. Reporter: He says he watched as the invader grabbed his electronic equipment. He fought back with his iPhone. Tapping into one of the camera's loud speakers. I simply told him, hey, I can see you. Just, please leave my home. Reporter: Scared, the alleged burglar does exactly that. Being embraced more and more by the mainstream, as situations like this happen and we see proof of their effectiveness. Reporter: Thanks to this surveillance footage, police quickly tracked down the Ã±i suspect,xd 22-year-old. And now, the alleged burglar is being held in jail on $25,000 bail. All thanks to a free app and iPhone and a few mounted cameras. Total cost, $150. For "Good morning America," Reena ninan, ABC news, New York. We're not sure he said pleased put down my stuff. But why not? Install it if you have an iPhone. We want to thank our New York station, WABC for their help on that story.
This transcript has been automatically generated and may not be 100% accurate.