Our most advanced SMD kit uses a tiny 555 SMD IC to flash 5 tiny SMD LEDs. The LEDs flash with a bright yellow green color. Because this kit uses a tiny SMD IC SMD resistors a tiny SMD capacitor and SMD LEDs it provides the best introduction to SMD technology. We do not recommend this kit for beginning students as the lead spacing on the IC is very tight and the kit must be assembled with patience and a small tip soldering iron. Great for advanced students colleges and technicians wishing to learn more about SMD technology.