1. The life of LED lamp is up to 20,000 hours, and the durability is more than 40 compared with fluorescent lamp 2. The brightness can be adjusted from 0 to 100% 3. Even if the brightness is adjusted, the color temperature remains the 4. There is no flash of fluorescent light, which has a good protective effect on human eyes under microscope observation 5. The brightness is above 35,000lux (the working distance of the ring light is 75mm) Plug Type: US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the United States, the Philippines and so on. Number of LEDs: 56 Input voltage: AV100~240V (Allowed AC90~264V) Input voltage frequency: 50/60HZ consumption: 4.5W Output voltage: DC24V Lighting : constant voltage and constant current Brightness adjustment range: 0~100% Ambient temperature and humidity: 0~40 Celsius/20~80%RH Colour:white Material:plastic Size:inner diameter: 63MM Package Contents: 1 x ring light Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.