OMAX 96 LED Focused Bright Shadowless Ring Light with Light Control Box for Stereo Microscopes 96 LED light; On/off power switch Variable intensity; ; Metal shell Diameter of ring light: 50mm; Matching objective housing size in diameter: 3/8inch ~ 1~15/16inch (10 mm ~ 49mm); Lifetime: 100,000 hours Power supply: Input 90V ~ 265V AC 50Hz/60Hz Output 12V DC 1-year warranty against manufacturing defects