Hi Nuno, welcome, happy to have you.
- We have a beep now, just turn up the volume
- We flash the chart before the change too (better tha a message in my opinion). You could easily add messages in about 20 seconds to each of your workouts but you would have to follow the workout in our app. I can explain if you want.
- Click the chart and it changes the zoom level
- I have a few Tickr HRM’s and they all work fine in both Android and Apple. Even the new arm band is great.
Let me know if any of this is not clear. If you keep having HRM problems please let me know and provide more details about your devices.