This is an intensity-adjustable 60-LED ring light with control box. Its mounting size is up to 2.4" (61mm) in diameter. The ring light has 1.77" (45mm) inside and 3.35" (85mm) outside diameters, respectively. 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. It is brand new in original box. Its retail value is $450. FEATURES SPECIFICATIONS: 60 bright white LED bulbs 100,000 hours of life Intense and focused shadow-free illumination Variable intensity control Fits up to 2.4" (61mm) mount rings Outside diameter of ring light: 3.35 (85mm) Inside diameter of the ring light: 1.77" (45mm) Power input: 100-240V, 50-60HZ, auto switching Packing List : One 60-LED Ring Light One Control Box One Power Cable One 48mm Ring Adapter Shipping Weight: 2 lbs