Features: It is simple to make, has obvious effect and is interesting. The circuit can be used for electronic toys, art lighting, LED billboards. This suite adopts simulation light circuit made with NE555 and CD4017, the blue and red LED flashed alternately according to the-pulse. This is a very interesting circuit for simulating the visual effects of warning lights. This kit is simple to assemble, suitable for electronics enthusiasts and students to practice. Specially designed for the training, cost-effective, red diodes and blue diodes can be opened with wire connections to expand the lamp distance, the original board number and model on the circuit board, the right for seat can be installed. Specifications: Material: Plastic Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Set Electronic Flashing Lights Kit