Croak croak, these cute froggy lights are awesome!  They run on either battery or dynamo power! Once wound up, your LED Frog can store the energy you created! Turn the handle to light them up. Eco friendly. Batteries included. Thank you for the email, it is much appreciated. I had actually just come off the phone to my Nephew who had said that the Birthday present was great. This is the 3rd time that i have used your website to send gifts to friends and family and I have to say that the service is exceptional. Keep up the good work and I shall be back soon. Sharon - NSW