Features 1. The lens of loupes made from excellent optical resin. The translucent rate is better than optical glass (optical glass is about 90%, our lens is 93%) 2. High Brightness, White Color, Long Life, Low Power, Cold Light Source 3. Batteries and Light Source separately reduce the front weight of the headband 4. The light source can work 15 days continually with only 3 pieces AAA LR03 battery 5. Comfortable headband loupe and convenience using 6. Magnification: 1.8X 7. Working distance: 180mm to 320mm 8. Angle of head light can be adjusted from 0°to 60° 9. Angle of loupe can adjusted from -60°to 60°