Inputs: one CDS (cadmium sulfide) cell Brain: circuit I made + old circuit Functions: Spider Mod hands from something. (like a tree) When a shadow passes over it it falls a couple feet (but it is still connected by a string) and then it climbs back up. Power Source: 2 AA batteries Problems: I had very many problems, most of which involved bad soldering connections. Time to build: The first one took me all summer to build, but now I can make one in one day. Cost: about $3.00 Notes: For the last few years I have been helped build and run a halloween house. The spiders that we used were sound activated, but only loud sounds would set them off. This year I made a couple light activated ones. They work much better. (when they work at all.) Email: nic8579@hotmail.com