[Richard]

So I first used the detector like Steve and the instructions suggest. My light bars didn't light up on leaks, so the thing went back in the box and I concluded it was a dud. For some reason later I tried using it with the supplied headphones and I could hear leaks. A ha!

Forrest, I think there is some frequency shifting technology in the device. The noise I hear when it locates a leak is a loud roar in the ear buds.