This is a 80-LED adjustable ring light with 3" (75mm) inner diameter, a 110-240V power adapter and a 1-7/8" (48mm in diameter) ring adapter. With variable intensity control, it 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. It is brand new in original box. It is brand new in original box. Its retail value is $550. Features & Specifications : 80 bright white LED bulbs Metal Control Box 100,000 hours of life Intense and focused shadow-free illumination Variable intensity control Power input: 110-240V, 50-60HZ, auto switching Fits 35-59mm mount rings Packing List : One 80-LED Ring Light One Metal Control Box One Power Cable One 48mm Ring Adapter Shipping Weight: 6 lbs