Smithsonian Jellyfish Tank. This Blue Led Lit Tank Will Show Imitation Jellyfish And You Will Watch A Bloom Of Jellyfish Swim. Includes 1 Jellyfish Tank, 3 Jellyfish Figures And A Color Poster With Instructions # Pieces In Set: 4 Number of Batteries: 3 Features: Led Lights Learning Skill: Science Power Source: Battery (not Included) Recommended Ages: 10 Years And Up Measurements: 3.5 Length/Inches Assembly: Assembled Base Material: 100% Plastic Battery Size: Aa Care: Wipe Clean Country of Origin: Imported p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 15.0px Calibri; -webkit-text-stroke: #000000} span.s1 {font-kerning: none} WARNING: CHOKING HAZARD – small parts. Not for children under 3 years.