This was one of several toys, including three "Science Museum"-branded gadgets, that we bought for a flight-themed "Science Weekend" with my nephews aged 5, 8 and 10.
This toy should demonstrate Newton's Third Law of Motion, often stated as "for every action there is an equal and opposite reaction".
To operate the helicopter, you blow up the balloon and attach it to the helicopter blades. Air is released from the balloon, channelling down the blades to be released at their tips, which should cause the helicopter to fly - up to 50m high according to the Amazon, though the box only claims 20m.
I wasn't expecting it to fly to such heights, and would have been happy with any significant lift, but we could only get it to spiral half-heartedly to the ground. Two balloons were supplied. They were flimsy and burst after a couple of attempts to get the helicopter to fly. An alternative product is this
Balloon Helicopter Novelty Toy at a fraction of the price. I haven't tried it, so I don't know if it is better, but it could scarcely be worse.
On the whole, we were very disappointed with the Science Museum toys, but I have to say that this was the worst. We just couldn't get it to fly at all, so it didn't provide any fun, and the only educational tip we learned was "don't buy the Science Museum's gadgets."