I bought the GE brand because it uses a magnetic field and not a motion detector, which means it will not trigger on deer, dogs, etc. In reality, it doesn't trigger anything 50% of the time. I have followed all instructions to the letter, including having to place the detector in an area I didn't want to to conform to the rigid requirements of the 'field of detection.'I get numerous false alarms, and numerous no-alarms. It is so unreliable in crying wolf that I ignore it most of the time. I think the principle is good, but the claims on the advertising are at best---exaggerated, and at worst---completely false. I would return it, but it is such a hassle to go through repackaging and shipping. I would not buy it if I were you.