I got in so much trouble for this item. Worth it.
I left it plugged into my inlaws tv on a Sunday. Didn't hear back until Wednesday when they finally found it after hiring a exterminator to come out, someone to look in their chimney, and then a hospital visit cuz they cut their arm looking in the attic. They finally figured out the noise was coming from the tv, but thought the tv was broken, so they bought a brand new one. When they were unplugging the old tv and taking it off the wall is when they found the device. This is when they finally called us. Now everyone hates me. This couldn't have gone any better, or worse. Worth it.