Adjust the strap-on harness (one size fits most) and enjoy powerful hands-free clitoral stimulation. The Butterfly's tail is cleverly curved to provide direct clitoral arousal. Go from a flutter to a throb with the simple twist of a dial. Let this Classix? Butterfly hum away solo or while indulging in intercourse. The powerful multi-speed power pack requires 2 AA batteries, not included. For the ultimate pleasure experience, go back to the basics!