This is an intensity-adjustable 78-LED ring light with control box. Its mounting size is up to 2-9/16" (70mm) in diameter, and it has an outer diameter of 4.17" (106mm). It works with wide band voltage power supplies from 100V to 240V. It comes with a 1-7/8" (48mm in diameter) ring adapter. This ring light provides cool, even, intense and focused shadow-free illumination. It is an ideal durable cool light source for microscopes. This kit comes with one year warranty against manufacturing defects. Features & Specifications : 78 bright white LED bulbs 100,000 hours of life Intense and focused shadow-free illumination Variable intensity control Fits up to 70mm mounting rings Outside diameter of ring light: 4.17 (106mm) Power input: 100-240V, 50-60HZ, auto switching Packing List : One 78-LED Ring Light One Control Box One Power Cable One 48mm Ring Adapter Shipping Weight: 1 lbs