The new Sofie is a significant improvement over the barebones model by Michael Kors, first introduced in 2017. Sofie's smartwatch now supports GPS connectivity so you can track your runs and other workouts while the phone is left behind. Unfortunately, the Snapdragon Wear 3100 has not yet upgraded. The updated Sofie continues to run the Snapdragon Wear 21
Michael Kors brings a heart rate monitor to his popular Sofie Smartwatch, which is no surprise as wearable technology is a must. However, PPG heart rate sensors such as the Kors watch and those found on most wearables on the market today are not fail-safe. PPG sensors may vary in effectiveness for users with larger builds or even darker complexions, as noted by AndroidCentral . Particularly strenuous workouts can also throw off the PPG sensor. People who need to seriously monitor their heart rate or fit into a demographic component that most wearables seem to ignore may be more appropriate if they are wearing an FDA-approved electrocardiogram (ECG) such as the Apple Watch Series 4 or Withings Move.