please include your name and contact details with your design. the video already stated that there's a bigger battery unit where the foam is replaced by another battery back. so, there you have it folks. sold by the box of 100 only. i remember reading a study that found that the presence of another animal was more soothing to a pet than even their human. i made myself listen to the whole thing, but it was a struggle. if you go for classic swimming pool style, there will be decorative details and custom tile work. 