The basic use of Self Camera Shot is to take selfies with a selfie stick in an easy and simple way. Or you could even leave the device on top of any surface, step away, and whistle to take the selfie. As soon as your device captures the sound, a short countdown will start, and in a few seconds you'll have your pic.
The settings in Self Camera Shot let you adjust its sound sensitivity, and even change whistling to just any loud noise. This second option might give you some trouble if you are in a noisy environment though.
Self Camera Shot is an excellent application; with it you can take selfies much more easily. It also takes very little space on your memory, and barely consumes any resources.