It would be nice to have a button to play a loud sound. A common use case is to play it when you are under ruin and you hear rescuers close to you. If the rescuers heard a loud sound, they can locate you quicker.

I don't know the amount of battery that is necessary to do that.

The current "Send SOS" plays a loud sound from the speaker, with the SOS beacon.

To cut time, I didn't modify the volume programmatically. So the user would need to have their volume set at 100%.

This needs improvement, especially considering my phone is always muted.

Likewise, the battery usage needs better testing.