Use AiLink on iPhone. I've spent too much time finding apps to use. Went back to Revain and that product and saw they had changed the app. It works well and displays the temperature in degrees Fahrenheit. I can turn off sound notifications. I seem to be getting accurate readings. The product goes to sleep when not moving, mine woke up as soon as I started moving. My complaints: The instructions are not very good (purchased 18.05, installed 21.08). I put the installation on hold until I had the metal valve stems installed. The size is large, I hope they will not affect the balance or tire wear. Again, finding a working app was a terrible experience.