AutoView Filters Allow You To Leave Your Helmet Down And Your Protection In Place. When You're Not Welding, They Stay At A Light-Fixed Shade For Good Visibility. AutoView Filters Automatically Darken In Less Than 1/25,000 of A Second. Four Sensors At Separate Points On The Lens Increase Your Ability To Weld Around Obstacles, Making It Possible To Move Your Head Side To Side Or Up And Down Without Lens Flutter. After 20 Minutes Without An Arc, It Shuts Off Automatically.