144-LED Microscope Ring Light with Adapter. You are bidding on an intensity-adjustable 144-LED ring light with control box. Its mounting size is up to 2.4" (61mm) in diameter. The ring light has 2.4" (61mm) inside and 4" (100mm) outside diameters. It works with power supplies from 110V to 240V. It comes with a 1.9" (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.