"Robo Fish move and swim just like the real thing! This super pack contains two fish and one turtles. Fill the included tank with water, put them in, and watch them swim without any assistance! They're a great alternative to real fish with none of the mess. Robo Fish are the robotic pets that you can watch for hours! This Robo Fish pack's ideal for ages three and up. Please note: 6 x LR44 batteries are included.