To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
It did was it was Suppose to. Stop Intruders, even had the Police show up from my neighbor. Told them get a warrant if you want to see what it see's Fruitless I know but they backed down. Not the case it works well.