I bought this after just getting an elite trainer. I use that with ROUVY and an iPhone 12. I have had zero trouble with it. It has worked perfectly every single time. Just connected it once in the app and it has been perfect. Great to see my heart rate again while training as I had given up on a Fitbit not working with other devices. I am sure this is just like the other quality heart rate monitors, but if you can get a good price on it, I would definitely give it a try.