Science doesn't have to be scary but it can be spook-tacular! Engineer a battery-powered haunted house with LEDs and vellum paper windows (for a ghoulish glowing effect). Customize some cool and creepy decorations (like cotton-ball cobwebs and paper tombstones) to finish off your boo-tiful creation. Explore electrical engineering and art and design through this Halloween-themed project. 9-volt battery included so your house is immediately ready to use after building. Finished haunted house dimensions: 6.5 x 7.0 x 6.0 inches (17 x 18 x 15 cm).