CRBN's ZERO Storm Fan banishes fog in severe weather. It boasts dual high-volume fans in a compact, durable nylon housing, swiftly and silently removing hot, humid air. Perfect for prescription glasses, it mounts on top of or under the visor of CRBN's ZERO Storm Unit. Powered by a CR123A Lithium battery (not included), it runs for over 30 hours. Weather-resistant circuitry ensures functionality in harsh conditions, with a slide on/off switch and LED power indicator. Key features include dual 5mm fans, 0.2444 CFM air exchange, easy installation, and compatibility with CRBN's ZERO Storm Unit. As an aftermarket attachment, it requires user installation, with instructions and a video available online. Avoid submerging it in water and clean carefully before reinstalling the battery.