CRBN ZERO Storm Fan eliminates fog in the harshest weather conditions. Features dual high-volume blower fans integrated into a compact ballistic nylon low-profile housing. Quickly and quietly removes hot humid air to eliminate fogging. Ideal for use with prescription eyeglasses. Integrated mounting design pairs with the CRBN ZERO Storm Unit for placement on top of the goggle or under the visor. Powered by a single CR123A Lithium battery (not included) with a continuous run time of 30+ hours. Weather coated circuitry allows function in the extreme conditions. Features slide on/off switch with high visibility LED power indicator. Dual 5mm High Volume Blower Fan x2 0.2444 CFM - Cubic Feet Per Min. Air Exchange Compact Ballistic Nylon Housing Weather Coated Circuit Board On/Off Switch With Low Battery LED Easy Install Dual Screw Secure Mounting Fits CRBN Zero Storm Unit