Uv Resistant: The Bill Provides Ample Shade For Your Ears, Forehead, It Has Its Own Electric Fan, You Can Feel Cool Without Holding The Electric Fan, And The Angle Can Be Adjusted To Meet Your Needs. Gentle Wind: It Has A Built-in 500mah Electric Fan With Three Gears. After Fully Charged, It Can Work Continuously For 2 Hours At The Highest Gear. When Charging, The Power Light Will Flash, And When Fully Charged, The Power Light Will Always Be On.