Easy to build with a clear, observable effect. Suitable for electronic toys, art lighting, and LED displays or billboards. Function and performance: a simulation light circuit using NE555 and CD4017 drives blue and red LEDs that flash alternately in sync with the timing pulses. Expandability and practicality: costeffective training kit. Red and blue diodes can be wired to extend lamp distance. The PCB is labeled with the board number and model for easy reference and maintenance. Designed to be compatible with common mounting and enclosure setups. Beginner friendly and educational: simple to assemble, making it ideal for electronics enthusiasts and students to practice circuit construction and timing concepts. Practical use scenarios: Create interactive electronic toys or decorative lighting that features alternating blue and red LEDs. Incorporate into small art lighting projects or sign/LED display applications to attract attention with a dynamic flashing effect. Use in a classroom or lab setting to demonstrate NE555 timer operation and CD4017 counting in a handson lesson.