It consists of different light and sound bricks powered by a 9V battery box. The light bricks can carry different coloured globes (blue, green, yellow or red) which can be changed. There are different lighting effects (flashing or continues mode) that can be choosen by the position of the brick. The sound brick exists in two themed versions: Town Siren (black) and Space Siren (white). Each of them has two theme typical sounds and a loudless mode, which can be choosen by dialing the brick.