iMeshbean Full Automatic Solar Auto Darkening Welding Hood Helmet Carbon Fiber Grinding Mask USA In full conformity with CE and ANSI Z87 standards; Battery replaceable; Full range UV/IR protection: Up to shade DIN16; Operating Temperature: -5 degrees C ~ 55 degrees C Solar power energy with lithium battery for backup; Easy user-selectable (DIN) variable shades from 9-13; Clear state:#3; Response time is 0.00005 Seconds or 1/20,000 seconds; Power Turns on and off automatically; Adjustable ratcheting headband; sensitive knob for you to adjust the sensitivity of helmet View size:96*48 mm; Light state shade: DIN4; Dark state shade: DIN9-13 Outside adjustable; Switching time: 1/30000S; Delay time: 0.2-1.0S fast-middle-slow can be selected; Sensitivity control: Low or high can be selected; Power supply: solar cells,no battery change required; Power on/off: Full automatic Eliminate long wearing uncomfortable, avoid the mask loose, let the staff in the high altitude used more securely,freely adjusting the button size to fit for different shapes of man&#039;s heads. <span class="a-text-bold">The Battery Card Slot: </span>with Backup battery . <span class="a-text-bold">Delay Time Adjuster:</span> Adjust the auto darkening welding filter from the dark to light time. <span class="a-text-bold">Sensitivity Adjuster:</span> Adjust the sensitivity according to the operation situation. <span class="a-text-bold">High Quality LCD:</span> Light evenly, image clearly. Solar Cell + 1X CR2032 installed (Replaceable) Effectively protect your eyes from sparks, spatter and harmful radiation.