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.
Pretty small and the color is the same as shown in the pictures. We had one the office that plug into the wall. But I have to run to another side of the office to use it, not very efficient. Now I have one on my desk and it is pretty quite compared to the big one.