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.
Hi, i bought this a couple months ago and it worked fine. That was until it doesn't go up. Only down. Plus it says "ASR" on the screen. I don't know what this means because i cannot find the user manual. Can somebody send me a digital copy of the user manual?