To take your photo, the app does two things:
- It looks for a face in the frame
- It needs you to shout louder than a certain level for a certain period
On the Triggertrap Mobile app, you can clap your hands or click your fingers to take a photo. On Triggertrap Selfie, we are looking for sustained sound, so you really have to yell to make it work.
Oh, and since it's looking for a face, that means you can't whistle, either: Go on, don't be shy, give your lungs and vocal cords some exercise!