Polaroid PL-MRL16 Digital Macro 16 LED Ring Light for Canon EOS, Nikon, Sony Alpha, Olympus and Pentax Digital SLR Cameras Ultra Bright 16 Cool Running LED's Ideal For Close-Up Photography, Especially Online Sales, Medical, And Scientific Applications No Bulky Battery Packs Or Cords Required! Provides Shadow-Free Lighting, Color Temperature: 5500K Uses 4 AAA Batteries, Will Last for More Than Three Hours