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.
While this button did seem to work for our office for a bit it doesn't anymore. More of a security risk now. After about two months of using this button daily it began to stick, in turn holding our door open. Would not recommend.