Compact LCD Mult-Function Flash (TTL, M, Multi) for Nikon DL24-500 Dedicated Shoe Mount Flash (i-TTL) With 8 levels of output control (1/128 - 1/1) Including Standard Automatic For Nikon Cameras Focus beam assist for low-light shooting Auto shutter speed setting Guide Number of 32meters (ISO 100, 105mm) Power Source: 2x 1.5V "AA" batteries (alkaline, lithium, NiCad & NiMH)