I bought these for my granddaughter with average expectations that they would actually work as pictured. Let me tell you that we loved them. My son has loved aquariums and fish all his life. He actually called me and laughed amazed at how realistic these little guys are. they dive, change their swimming speed - he called it "madness". The only joker for me is that I don't know how long the battery will be hanging in there, only time will tell.