http://www.youtube.com/watch?v=NNkysbL3d0A Uses AA battery/LED lightbulb Product size (H x W x L): 11.5cm x 8.5cm x 13.5cm This product is handmade/wooden. Margin of error is approximately 0.5cm. Our designers have a day-job. We will respond to Pinkoi messages as quickly as we can. Thank you for your patience. Made in Taiwan. After my daughter was born, I had always contemplated about the inventions that I could produce to interact with her. One day, as I took her hiking,I saw the white mushroom that had grown out from the decayed wood in the nook, and felt the pulsations seeing the life-force of the nature. I longed to share with her who had fallen into deep slumber. I wanted to share this with her though she was asleep. Therefore, The Mushroom Light took form.