Age: 10 Years Old Or More > MoreFeaturesBatteries Used: 006P X 1 (Sold Separately) / Current Consumption: Approx. 2-4.2MaSemiconductor Used: 1 Transistor, 1 LedEstimated Construction Time: About 2 - 3 Hours; Recommended Age: 10 Years And Up (Estimate)Board Size: Main Board 2.4 X 2.4 Inches (60 X 60 ..