Tactical Goggles Defogger Defogging Fan Anti-fog Kit for Airsoft Shooting Motocross Mountaineering Protection Glasses Ski Mask Product Name:Goggles anti-fog kit Item No.:GG-ACC-01 Product size:15*15*4cm Product net weight:0.174KG Product gross weight:0.238KG Product colour:Black Main material:abs Applicable scene:Hunting, outdoor sports and other Tactical Airsoft Games etc. Note: The power of this fan is low, the tiny sound produced by the fan blades due to the slow speed rotation is normal, you can adjust the fan to the maximum power by turning the knob or pressing the speed button to make it fast and effective in removing the fog in the goggles.