Amazing, life-like moving butterfly gently opens and closes its wings silently! Perch it on a plant or on your computer monitor. People will say, "Is it real?" Fascinating, decorative and fun, these butterflies are designed to be in the sun and will not fade due to direct sunlight! There is no motor. These butterflies use an amazing technology called "Muscle Wires". It is a wire that changes shape due to the warmer temperature change created by electricity going through it. No motor means no noise! A battery case is available that allows you to power the butterfly from two AA batteries! The battery lasts approximately 8 hours, which is perfect for Halloween, a costume party, a trade show and more! 8 Butterfly styles and 2 Dragonfly styles in stock now! These butterflies are also available in a USB version (sold separately) for powering from a computer or tablet. USB wall adaptors do not work, though. A "Y" Cable is available for powering two butterflies from one adaptor (saving your wall outlets for other things!). Useful for teaching students about Shape Memory Alloys. Allow students to see the butterfly work up close and ask open-ended questions about how it works. Make an easy, short and fascinating unit that will stimulate students' critical thinking skills. Contact us if you would like to purchase the USB version a Y Cable, a table-top display or an 8-butterfly display! (847) 960-8520 firstname.lastname@example.org Are you a retail store? Wholesale terms are available, too!