4M Tin Can Edge Detector Science Kit</br></br>Product Description</br></br>Part of the Eco-Engineering/Green Science Series;Fun science project creates a edge detecting robot;All you need is a small crosshead screwdriver and empty soda can;Requires 1 AAA battery?? not included</br><br/>http://www.amazon.com/gp/product/B01M5K9OZL