About this item Unparalleled Defogging Power: The general-purpose air pump conveys wind to the inside of the glasses, effectively blowing away water vapor to achieve the desired defogging effect. Say goodbye to obscured vision due to fogging Adjustable Wind Speed: With the knob located on top of the air pump, you have complete control over the wind speed, allowing you to adjust it to your preference for optimal comfort and clarity Long-lasting Performance: Measuring at 3.1*3.1*1.4 inches, this device charges in just 1-2 hours via a Type C cable and provides an impressive 6-10 hours of continuous use. The color indicator displays power levels, ensuring you're always aware of the remaining charge Convenient and User-Friendly Design: The magnetic tube header design and one-hand operation knob make for quick and convenient use. Additionally, the rubber-covered buttons provide comfort and resistance to dust, ensuring a hassle-free experience Versatile and Easy Installation: This kit fits a wide range of headgear and can be easily attached using a hook-and-loop patch. Moreover, it includes a punch for do-it-yourself installation on soft-edge goggles, making it a versatile and user-friendly addition to your gear Note: 1. Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. 2. The measurement allowed error is +/- 1-3cm.