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.
These things suck! They sometimes just charge, they have horrible battery life and they glitch out all the time. Sometimes they just won’t work for the day. Frankly if there was any other product then people would buy that instead.