Smart Ring Health Tracker with Heart Rate, Blood Oxygen & Sleep Monitoring - Free Subscription Included - Waterproof Fitness Ring with Charging Case - Perfect Gift for Men & Women (Silver) | Ideal for Workouts, Sleep Analysis & Daily Health Tracking

This is a review update, the manufacturer reached out to me and was able to explain what was going on. The Android app had not made it to Google Play in time for me to review it. It has since made it's way there and has been approved by Google Play, meaning that the app is trusted at this time. I did install the app, and was able to link the ring to my phone. It seemed mostly accurate with the exception of the temperature. It read 179 degrees Fahrenheit. I don't think I would be writing this review if i were that temperature, LOL. Anyway, the ring does what it says it does, and the manufacturer has assured me that no personal or tracking data will make its way out of the US or onto foreign hosted servers. This was much appreciated. Well done for being a champion for personal privacy!=================================================================================I held out for hope on this smart ring, it's a novel idea with a lot of promise. It seems to work for the most part on iPhones for now, but what concerns me is the Android app and personal security. It's not available on the Google Play store and has to be sideloaded. With the rampant & malicious hacking climate today, it is extremely unwise to sideload applications into your smartphone for any reason even if benign st first. Reason being is a simple app update with a malicious payload could then provide an attack vector for a threat actor. I do not know the reason why this app is not available on the play store, but I assume that at some point Apple will find a reason to remove the app as well. I also found it odd that the ring being Bluetooth was not scannable. Another app approved in the play store which should recognize the ring, does not, meaning this ring requires only their custom app running untrusted code which is highly suspicious. I'll have to mark this as a 3 star since I could not properly test the ring on Android using an authorized & secure application. I need to know without a shadow of a doubt that my personal data & private information does not end up in a foreign governments servers.