The "Fly on the Wall" shoot images images automatically.
You just setup up a time frame in which the app randomly selects a moment to take a picture.
The app will continue shooting new images as long as its turned "on".
Its perfect for documenting projects, parties or observing something over time.
Advice: If you want to set up an exact time interval on which the app shoots just set both triggers ( the "earliest" and the "latest" ) on the this value.