This housing is an underwater power supply developed by Sealed Enclosures for use by divers. It can easily be clipped on a belt or strapped with Velcro to the leg or arm. The batteries it takes are a standard D size that are easily available, with up to ten batteries fitted, 12 volts can be assured. A Subconn connector is incorporated into the body for plugging in lights etc, for safety the housing has a fuse that automatically resets and a relief valve in case gases are given off by the batteries.