Construct a super sensitive spy phone</br>Conduct various interesting experiments</br>Can also be used as a hydro phone or a geophone</br>Fun and educational</br></br>Product Description</br></br>Become a super detective with this cool spy kit. Conduct interesting experiments on sound. Discover how sound travels and learn some amazing facts about spy phones and sound. It can also be used as a  hydrophone to detect sounds under water and as a geophone for detecting sounds in the ground.</br><br/>http://www.amazon.com/gp/product/B004NEP7P2