The Lighted Construction Kit.

"This construction kit uses translucent pegs that light up when you connect them, creating softly glowing reds, oranges, greens, whites, purples, and blues (Play Video). u000Du000A You can create antennaed insects, fat-tired dune buggies, streamlined starships, and more with the kit's 72 differently shaped pegs--straight, t- and u-shaped pegs, wheels, and flat squares--that have built-in, multi-colored LEDs. Each piece easily slides into the next, passing along low voltage current supplied by the included power base which lights each LED. The LEDs will last for 100,000 hours. Includes three AA batteries. Ages 7 and up. Box 13 1/4"" L x 8"" W x 3"" D. (2 1/4 lbs.)"

Purchase the The Lighted Construction Kit. via a secure server from Hammacher Schlemmer.