Longer Operation and Rechargeable Power: The fan comes with high quality Lithium battery 3600mAh (included). Operation time upgraded is about 6-26 hours (Varies depending on the wind speed). It can be also used and recharged via USB port from computer, power bank, USB charger or other devices with USB output. | Strong Airflow and 180° Rotation: The fan with 3 settings of the air flow speed can be adjusted among low, medium, high according to your demands. The fan can be rotated in 180 degrees so you can place it in multiple wind angle. | Quietness: The fan boasts a quiet operation to keep you cool while making minimal noise so you can focus without any distractions. The minimum noise is close to 20dB, it keep quiet even on the highest fan speed. | Compact and Portable: Easily carried in bag when you go out or travel and Perfect for office, home, dorm, camping, library use, etc.