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.