Flash Guide Number: 15 Feet Effective Distance: 1.96 Inches- 5 Feet Color Temperature: 3000-15000K Exposure Time: 1/100s Power: 4 x AA batteries or Ni-MH Rechargeables, Weight: Approx. 7 ounces Ring Light / Flashes are now more popular than ever for portrait and close-up photography. Initially used by dentists & practitioners they are now available for the average layman or laywoman to help illluminate close-up images or instill colorful and dreamy effects. Another feature they have is their ability to have continuous light for any application in photography or video. The light intensity can also be adjusted. The MR48 series features a very bright & clear LCD display, High luminocity and low static power consumption. Functions as a photography light as well as a flash with the flick of a switch. For flash photography camera must be set to manual exposure while commander sits on shoe. Left and Right flash functions make objects appear 3 dimensional, 7 (Seven) luminance levels for any photography application, 4 (four) colored diffusers (Oyster white, Blue, Orange, transparent). Includes Light, Instructions & Warranty papers, Lens Adapters/Rings (If Necessary)