"The professional lens boasts a 40% greater viewing area than most lenses. Auto Darkening: Yes, View Area W x H (in.): 4 x 2, Switch time (sec.): 1/16,000, Variable Shades: 9 - 13, Power Supply: Battery, Base Type: AAA, ANSI Approved: Yes, CSE/CE Standard: Yes Lightweight and flexible headgear Includes storage bag and 2 spare poly shields"
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