Parents stick the designated danger label (forbidden symbol, which can be made by themselves) on the corresponding danger source (gas stove, railing, etc.). The child presses the switch and shakes the product, and a color of light will appear at the bottom. The child needs to search for the color scan of the corresponding item, and the sound effect/music will be emitted correctly. If the danger source is recognized by scanning, the danger sign at the bottom of the product will pop up, parents are required to open for reset (press the sign back again.)