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 analyzes reviews to verify trustworthiness.
This is used in our kitchen, mostly for time. But the alarm works too, as we found out the first night when it unexpectedly went off due a factory setting. But the accompanying instructions are clear, and now it's doing what we want - a true bargain!