509 Sinister X5 replacement lenses. Simply push a button and the Ignite lightweight, strap-mounted rechargeable lithium-ion power pack quickly heats the entire inner lens surface to 104°F. The system features a 2-minute auto-interval mode or always on' mode, along with a continuous runtime rating of up to 5 hours at max temp for all-day performance.

FEATURES

• Ignite heated dual lens technology 
• Thermal Conductive Transparent ITO (Indium Tin Oxide) heated lens 
• 104®F maximum heating temperature