Features: Anti-scratch: lens covers the anti-scratch coating. High-sensitivity probe, high efficiency, will not cause any damage to the glasses. When the arc is generated, the screen is darkened from the normal state, and when the arc disappears, the screen returns to the normal state. The lens is resistant to strong light and UV rays, at the same time, it is resistant to impact and abrasion, has a long service life. Specification: Frame material: ABS Lens material: PC Color: black Variable brightness: No.11 automatic darkness Power supply: solar energy Delay time: 0.1s-3s Variable speed: 5/10000s Item weight: 54g / 1.9ounce Package size: 170 * 75 * 60mm / 6.7 * 3.0 * 2.4in Package weight: 78g / 2.8ounce