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.
It is the worst product I ever bought. I was really disappointed with this product. I bought this product for my son. He is 8 yrs old. Within 10 days it lost its temper and the air gone through all the stitches. And the air pipe is damaged once I use to pump it. Don't buy this product. It is not for worthy.