My niece 6 years insisted this siren. I was really doubtful then I said to myself: it's Christmas; the point is not whether you think it's good or useful, but it makes him happy. Well, I should have followed my intuition ... Gift totally uninteresting (my niece is not even concerned): the siren does not actually swim, she climbs up and down along the walls of the aquarium and So it is not very tight obliged to lay it on a mop. I can not recommend this purchase!