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.
User friendly, very easy to set up. I like the fact of changing batteries rather than recharge, when using for extended periods you don't need to wait for a recharge just change batteries and your good to go. Sound and everything else about the unit is very good.