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.
The Pump unit i received was struggling and took long to refill some leaked air from a car tyre. Materials used does not inspire confidence. The advantages i saw were the power connection options and the really small size - very portable. Would recommend for a bike but not for cars.