I didn't get a quantitative definition of effective, I asked how far it would detect a heat signature, they said 15 feet. I'm sure it "works" at greater distance, the question is how much noise you get and how reliable it is at greater distances.
They had one on site and the reason I asked the range was because I held it up and looked and it seemed very very local. I'd be happy to see this thing produce a heat signature that you can identify as human at 100 yards, that isn't the same as a human's heat signature at 100 yards though.
They had one on site and the reason I asked the range was because I held it up and looked and it seemed very very local. I'd be happy to see this thing produce a heat signature that you can identify as human at 100 yards, that isn't the same as a human's heat signature at 100 yards though.