After the sensor is connected to the iPhone, the 'SportsTracker' app can register the pulse.
SportsTracker registers place time pulse speed, and displays it in 'Workouts'.
The workouts can also be uploaded to a personal account on the internet and viewed in the browser. Sharing with friends etc. is a matter of course.
The connection is fast and stable.
In my opinion, the app in combination with this sensor is top-notch.