Outdoor Summer UV Protection Solar Powered Cooling Fan Hat Fishing Hiking Camping Sun Hat Wide Brim Bucket Hat. Solar and Battery Power: Dual power supply: Lithium battery and solar power, switchable freely. High Solar Efficiency: Solar conversion efficiency reaches 80% or higher. Water Resistant Design: Fabric features water-resistant properties for outdoor use. Adjustable Head Circumference: Size is adjustable for a comfortable and secure fit. Durable Fabric Composition: Made of 78.5% Cotton and 21.5% Polyester for breathability. Strong Tensile Strength: Tensile strength is at least 8.5 MPa for durability. 500mAh Battery Capacity: Fan lithium battery capacity is 500 milliamps. UV Protection: Wide brim design provides effective summer UV protection.