http://www.nikon.com/news/2014/0912_sb_04.htmThe SB-500 is an easy-to-use, compact and lightweight Speedlight powered by AA-size batteries and equipped with a high-performance LED light optimized for photography of art and other objects and close distances. The SB-500 is optimized for use with cameras compatible with the Nikon Creative Lighting System (CLS)*. It works as both a master flash unit and a remote flash unit with wireless multiple flash-unit photography, allowing users to enjoy flexible expression using various light sources.