where they shouldn t. i heard of one, a guy with a camera, motion activated. set it up in a gym back and took it maybe in the ymca. reporter: these cost a few hundred bucks and technology is making smaller ones all the time. some broadcast video wirelessly over the internet. so, how can you tell if there s a hidden camera where you are? this is a low cost camera finder. reporter: private investigator brian curry runs a spy shop near atlanta. i m seeing a big, bright, red blinking dot there and it s telling me there s a camera on me. reporter: more sophisticated detectors can seek out wireless camera signals. it s scanning the frequencies. it s picking up lots of different cameras? that s going to be the flower pot camera we had on. reporter: it s technology versus technology, potentially giving people the tools to invade your privacy, but giving you a chance to catch them.
help the good guys. a camera built into the bridge. whatever you see, it sees, then transit mitts it here. reporter: some end up where they shouldn t be. i recently heard one, a guy had a pen camera he got. it was moex activated. set it up in a gym bag. reporter: these cost a few hundred bucks and toblg is making smaller ones all the tile. some even broadcast their video wirelessly over the internet. so, how can you tell if there s a hidden camera where you are? technology can help with that, too. this is a low cost camera finder. reporter: this private investigator runs a spy shop near atlanta. he sells the cameras, but also helps people watch out for them. it s telling me there s a camera on me. reporter: more sophisticated detectors can seek out wireless camera singals. it s scanning the frequencies. reporter: it s picking up
in a gym bag and i think in ymca or something. reporter: relatively affordable. a few hundred bucks and technology is making smaller and more sophisticated ones all the time and some broadcast it wirelessly over the internet. how can you tell if there s a hidden camera where you can? technology can help with that, too. this is actually a low-cost camera finder. reporter: private investigator brian curry sells the cameras and helps people watch out for them. seeing a big bright dot. it s telling me there s a camera. they can seek out wireless camera camera. reporter: seeing is picking up lots of different cameras in here? yeah. that s the flower pod camera. reporter: technology versus technology. potentially giving people the tools to invade the privacy an giving you a chance to catch them. it is pretty amazing. hold it in the hands. different ways to work.