Nikon SB-30 AF Speedlight for Nikon Digital SLR Cameras Built-in 17mm wide flash adapter provides coverage for lenses as wide as 104&deg; angle of view TTL Wireless Slave Flash function (even with Coolpix series digital cameras) doubles or triples effective flash shooting distance, and Built-in infrared panel triggers off-camera Speedlights during wireless multiple-flash operations 50&deg; downward tilt allows on-camera closeups from 1 to 3.3 feet Power Source - One 3V lithium battery (CR-123A or DL-123A) ? not included