" Exciting kit electronically creates an exploding “firework” like display. Kit features 17 micro red LEDs, 7 green mini LEDs and 1 jumbo red LED. The circuit uses a 2 transistor multi-vibrator that alternates between the “rings” of LEDs, which cause a display like “sky rocket” type fireworks. Great attention getter in a darkened room. Attractive and makes an interesting intermediate project. Size of board: 3.875"" x 3"". Operates from one 9V battery (not included). Complete with all parts, PC board and instructions. Skill Level 2. "