Harnessing the power of the sun, this innovative toy also works as a study in alternative energy applications. It makes a great science toy for young science lovers, teachers and owl aficionados. Made from plastic they have a built in solar panel that does not need batteries they just need a sunny window sill to get them dancing and waving. Solar powered and no batteries - All you need is a steady light source.When the light illuminates the solar band, it will automatically swing. High quality material, reliable and non-toxic. Can be given to friends, colleagues, family or yourself as a birthday or holiday gift.