You can use thermal cameras like this to survey your home and make sure there are no warm/cold air leaks that could affect your electricity or heating bill. It can also help you spot smoldering coals or small fires, in case you smell something burning and can't figure out where it's coming from. By the way, if you're a developer, keep an eye out for iOS and Android SDKs that you can use to create apps for the device. Otherwise, you can buy or pre-order the new FLIR One right now for $250 and the old cases for $150, if you don't mind their lower resolution.