I bought the machine because it had only positive reviews with 5 stars up to my purchase. The TV-effect was not convincing for me, especially the red and green LEDs flicker seemed very unreal, moreover, where the repeated blinking repeated in half minutes intervals. Because I want but since no return unit, I opened it and the red and green LED covered up on each one. The effect is now much more natural and I am satisfied. At a hundred percent protection against burglary, but I would not leave me. Jo