To calculate the overall star rating and percentage breakdown by star, we do not 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.
When I plug in the device to mobile charger , the power button becomes green. When I press the button, it becomes red for few seconds only then it turns back to green. And there is no beep sound after five minutes as mentioned in the leaflet comes with the device. Please advise.