When the phone is placed face down flat it vibrates to confirm, that it started recording audio.
When you pick up the phone it stops recording and saves.
If the sensors fail and it continues to record, a notification will tell you it's still recording and you can tap it to stop. Android wear compatible.
Recordings are saved here as 3pg files:
V5: Changed the name of the recording to append the date on the filename.
Rate and review within the app in the Community section.