You can watch your baby real time by taking the application to video mode.
When you sleep at night, you can choose the alarm mode instead of watching your baby continuously. Thus, the noise in your baby room will be continuously measured and will be given an alarm to you when necessary.
With the device you place as a baby camera, the sound amplitude values are regularly measured and displayed on the parental control unit screen in a graphical environment.
Both devices are communicates over your local wireless network and will not waste your internet quota.