The 4.5 inch wide by 3 inch tall Superman Symbol Belt Buckle w/Speaker requires 2 triple A batteries and will combine three of your most favorite things; belt buckles, speakers, and the Man of Steel's symbol from DC Comics. Now only if we can figure out how to get some pizza in there and we'd would have 4 of your most favorite things. The Superman Symbol Belt Buckle w/Speaker is compatible with almost any electronic device that has a headphone jack...that pretty much includes all of those sophisticated smart phones and I-Products that you all seem to love. Get the Superman Symbol Belt Buckle w/Speaker and fire up the John Williams soundtrack.