the shading level, adjust the shadow effect after auto-darkening, easy to operate. 【Sensitivity Adjustment】: It is designed to adjust the time from light to dark, the higher the sensitivity, the shorter the time from light to dark. 【Delay Time Adjustment】: Support to adjust the time from dark to light, the longer the delay time, the longer the time from dark to bright. 【Heat Insulation Facemask】: With wide applications, it can blocks arc light, infrared light, ultraviolet and other harmful lights, and also blocks welding slags, avoids high temperature burns, protects your face and say goodbye to arc light hazards. 【Comfortable to Wear】: Large inner space, easy to wear and breathable, no stuffy, no oppression. More comfortable to wear, and will feel not tired after long time wearing, adapt to a variety of headshape. 【Power Supplying】: Built-in 250mAh CR2032 battey, solar charging design, can provide long endurance, economical, energy-saving and environmental protecting, and with high reliability.  Specifications: Name: Welding Facemask Material: PA/PP Bright state color grade: DIN4.5 Dark state color grade: DIN9～12.5 Dark state color grade adjustment mode: external control, stepless adjustable Variable light response time: 1/10000S Induction sensitivity control adjustment: stepless adjustable Recovery time: 0.1S～0.8S Power supplying: 1 * CR2032 battery (included) or solar energy Rated capacity of lithium battery: 600mAh Operating Temperature: -10℃～65℃ Number of Arc Sensors: 2 Infrared/ultraviolet protections: DIN15 Frame size: 110 * 90 * 9mm / 4.33 * 3.54 * 0.35in Window size: 92.5 * 42.5mm / 3.64 * 1.67in Package size: 310 * 185 * 230mm / 12.20 * 7.28 * 9.06in Package weight: 480g / 1.06lb Packing List: 1 * Welding Facemask