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's great and works well, it's good value for money beam only goes a few metres it shows up maybe 50% on mobile device infrared night vision video depending on distance of 0-2meter faraway object its 850nm beam shines on.. Only bad thing is the useless beam focus it is nothing 1cm movement. Grrr 🙈👍😀