Science Purchase Animated Butterfly in a Jar Yellow Swallowtail Figurine Simply tap the jar to activate the butterfly's realistic action. Ambient sound may also make it flutter! The Glass Butterfly Jar measures approx. 17 cm x 9.5 cm x 9.5 cm Takes 3 x AAA batteries (not included) Your butterfly will move for around 90 seconds, Batteries have automatic standby so no need for a power button!