Stay Cool, Stay Connected! 🌟 Charge your devices during outages with USB port. Designed for on-the-go cooling, perfect for travel. Customize your breeze with two powerful speed settings. Maximize efficiency with automatic power selection. Stay cool anywhere with multiple power sources. USB charging port Rechargeable batteries 10-inch powerful blades The O2COOL Treva Portable Battery Operated Fan features a powerful 10-inch blade design, smart power technology for energy efficiency, and versatile power options including USB charging, making it ideal for camping, travel, and indoor use.