I've had this item for nearly a month. I have it set up in my detached garage, about 75 feet from my house, so when I leave my metal garage door open, and look-e-looz happen to come inside, it will alert me. This should be noted it's not a direct line of sight so the signal is being transmitted directly thru a metal building. I have not caught anyone yet, but have tested the unit many times, which it seems to detect movement as designed and set off the alarm 90-95% of the time. What else can you expect for a fully wireless unit. I wish it were white and not dark grey. Also the receiver has, what I think is odd, two slots for mounting, where it should only have/need only one, because it's not that big or heavy to necessitate two...therefore you need two screws side/side to mount the receiver to the wall. Also wish it had a more not so disturbing alert. The shortest tone/alert is a: ding dong, ding dong, ding dong, ding dong (4x's - though its much more electronic sounding than I make it sound). It really should just have a single ding dong alert for the shortest alert.