As the Robofisch with me arrived I was a bit surprised at the size. I did not read the product description decent and imagined it much bigger. Otherwise, he has given us in his very short life a lot of fun, it worked perfectly, Schwomm autonomously in the tub back and forth and dived up and down. I think he has my son about 4 - 5 times accompanied in the bathtub until the battery was empty. Since then he has not stopped working despite new batteries. The idea is funny, but for the money I do not know if it would have to necessarily buy again.