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.
Very good product, when I was still picking it in various fingertip monitors, I accidentally discovered your product. Obviously this uses a very unique design and very professional technology, so I can be very comfortable Wear it all night to monitor my heart rate and blood oxygen saturation, don’t worry about slipping from your fingers, the greatest feature is that it will send a vibration to remind me when it is below the limit I set, so that I don’t disturb my lover the situation of my sleep and change my sleeping position, great design and technology, excellent value for money, thank you for your contribution to people
1. Its one of the only device that can store the O2 level for the whole night. 2. You can download the data over bluetooth it to their app ViHealth and see the trends. 3. Can be programmed to vibrate when you have below x% O2 level.