Chances are, in the last weather-related emergency you endured, there was a run on the larger-size batteries that many flashlights, portable radios, and portable televisions depend upon. However, the standard "AA" battery that you keep around for remotes, digital cameras, and your childrens' toys was easy to obtain. These adapters take your "AA" size batteries and convert them into a form that will easily deliver power for your devices that depend on "D" size batteries. Four adapters come in a package. A perfect item to keep in your emergency kit.