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.
Simply replace an existing USB lead that is only carrying power and you can switch the power on and off. In my case it was a Raspberry Pi. This "merely" removes the need to unplug and plug in a power only lead. Not a really big deal, just a useful convenience.