In the image above you can see a red and black wire sticking out on the right side of the image. This is the wiring to the on/off switch. Underneath is the circuitry for the solar powered fan, LED light, and horn. It's a small solar cell on the roof, so it can only power one device at a time. As a result, you have to disconnect and connect the different wires underneath. It's a great way to show the basics of circuitry to kids.
Also, inside is a battery powered pack, but we didn't put the batteries in. Who needs batteries when you have solar power? :-)