Do not settle for less. With a color temperature close to daylight (5000K) and a extended battery life (up to 200 minutes), the Opteka RL-12 surpasses all of the current ring lights on the market. Attaching the Ring Flash to the front of the lens of your cameras enable illumination of subject in Macro Close - Up photography at a shooting distance of up to approximately 31.5 inches. One thing your camera built-in Speedlight may not be able to do. The Automatic Macro Ring Light is the convenient and creative lighting solution for copying documents, medical, dental, nature and small subject photography at short working distances where built-in and conventional flash units are hard to use. Utilizing a circular tube as its light source for just the right amount of illumination, in certain situations, it might even be the only way possible to light your subject. Specifications Lamp Type:12 LED"s Modeling Light:Yes, continuous mode Lens Mount Size:52mm, 58mm, 67mm, & 72mm Power Source:4 AAA Batteries (included) Angle of Coverage:Approx. 60° Dimensions:5" X 5" X 1" (127 X 127 X 25mm) Weight (with batteries):5.5 oz (155g) What"s in the box ~ RL-12 Ring Light ~ 4 AAA Batteries ~ 52mm Adapter ~ 58mm Adapter ~ 67mm Adapter ~ 72mm Adapter