This Polypropylene helmet shell is extremely robust, with comfortable and uncomplicated head gear. The external shade control dial can easily be adjusted wearing gloves and is mounted on an Aluminium shaft so is insensitive to any damage. Internal sensitivity and delay adjustment from fully variable dial controls, not just fixed high or low switches. 

• Variable Shades 9 - 13.
• Sensitivity control.
• Delay control.
• Thick durable construction.
• Twelve month warranty on lens.
• 110 x 90 cover lens.
• Light shade DIN 4.
• Dark shade DIN 9-13.
• Switching Time 0.0001 second.
• Dark to light delay 0.1 -0.9 seconds stepless adjusable.
• Operating Temperature -5o C (23o F) - 55o C (131o F).
• Viewing Area 42 x 96mm.
• Power supply : Solar cell.