We bought this at the Science Museum, but were disappointed. Not much fun, as it quickly broke! The screw cap to fix it to the bottle has cracked and disintegrated.
The quality of materials used is not good - the plastic is very hard and fragile.
Also, the design is not quite right - the blades are very small, so you need a very strong wind before the light will come on...more chance of it falling over and the plastic breaking!!
Expected better quality from the Science Museum.