The next 15 minutes you can lie back relaxed and watch as the kids try to capture the very many bubbles. This is shrieked until the last neighbor looking out the window.
After that cake is eaten, because all are exhausted.
As the children also touch each other when catching the bubbles, making it the first inhibitions, especially with new children who have been invited to the birthday, broken.
Conclusion: strong buy recommendation. The part is durable and Pustefix Refill (1 liter) holds well up to 10 birthdays from.
Oh yes: the batteries are not included.