Strap it on and enjoy! Shane's World Venus Butterfly is jelly soft and powerful. The fluttering butterfly wings have a 3.75in wing span. Two AA size batteries, not included, provide the powerful vibrations. The ergonomically designed power pack has an easy to use multi-speed dial. One size fits most with the comfortable and fully adjustable waist and thigh straps. Let this butterfly tease and delight your erogenous zones!