Hand crank doorbell for your room
MAKE Use the gears, bike bell, screws, washers, nuts, etc. to build a doorbell for your room!
LEARN The crank, the rack, the pinion, and how cog wheels work.
PLAY Turn the crank: look at the gears enter into motion, then push the hammer that hits the bell.
Once it is all put together, you can paint your doorbell. There are 4 holes on the plank so you can screw it to your bedroom door.
All the kits come with a booklet in two parts that contains: 1-step-by-step illustrated instructions2-educational content