When you'd like to take a picture of a baby or a pet with a camera, have not you thought "Watch me baby!" ?
This application is to attract subject's (baby or pet) attention by ringing "the tone of the toy" simultaneously with the camera function, and it has been developed for the purpose of taking a picture of the camera look. It may be possible to turn a look to a camera with this. Just, it's also possible to use it as "the application which makes the noise of a toy", so it can also be used to cradle a baby.
When a baby and a pet take the picture lying idle, shutter sound is often annoying, so the dumb (silent) shutter function has been added.