Description:    144Pcs Bright LED Light White Ring Microscope Illuminator Microscope Light Source  Specification:  144 bright white LED bulbs. Variable intensity control. Intense and focused shadow-free illumination. 100、000 hours of life. Power input: 110-240V、 50-60HZ、 auto switching   Fits up to 2.4" (61mm) mount rings. Inside diameter of the ring light: 2.4" (61mm). Outside diameter of the ring light: 2.83" (72mm). Working distance: 40-250mm    Package included:  1 x 144Pcs LED Light White Ring Microscope Illuminator  Details pictures: