This is a 60-LED adjustable ring light with 2-7/16" (62mm) inner diameter, a 120-220V 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. Its retail value is $250.