This kit combines CMOS IC circuitry and 10 jumbo, green LEDs to produce a unique visual display. LEDs continuously light from right to left. Easy to build kit makes a great conversation piece, game room display, attention getter, etc. Operates from one 9Vbattery (not included). Complete with all parts, PC board and instructions. Skill Level 2. This kit requires soldering of components to the PC board while building.