I got this to detect ghosts. But, now I realize my home is bombarded with nasty, invisible electrical waves and radiation. We have Wi-Fi, Bluetooth Phones, Computers, IPads, and a very large power line that runs across the front yard above our front door. We had a storm knock that wire down and it burnt the grass where it was lying on. We were told to stay inside the house, not touch anything metal until the power company came and put it back up on the pole. That tells me a lot of power is rushing through that wire. I charged this detection unit up as soon as I unboxed it. When I turned it on, the blue screen turned red and the alarm started to sound off very loud. Made me a little afraid until I realized my laptop computer was a few feet away from the detector.I turned the alarm off and I walked to the other room and the numbers did go down, but the screen stayed red. I guess all the electrical interference might be keeping the ghosts away. BUT, I have a camera mounted in my basement in case it floods down there again. It keeps warning me of a "human" presence down there and all I see is shadows moving. Plus the only access to the basement is in my dining room and that door is always bolted. I am lucky to have lived in haunted houses before, so ghosts do not bother me.....yet.