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 terrible, it took me a lot of time to install it to my van and after using it a little bit that is results what i got! It wasnt effective and didn't work perfectly but i decided to keep it as it took a wild to make it work and didn't wanna reinstall it again. And now i faced all this problem which is caused. Doesn't work, poor quality and waste of time. Not recommended at all!