Butterfly in a Glass Jar - Monarch The Monarch "My Butterfly" Jar is a realistic butterfly toy that flutters around in a jar! The Glass Butterfly Jar measures approx 17 cm x 9.5 cm x 9.5 cm Takes 3 x AAA batteries (Included) Simply tap the jar to activate the butterfly's realistic action. Ambient sound may also make it flutter! Your butterfly will move for around 90 seconds, Batteries have automatic standby so no need for a power button!