[PORTABLE FOLDING DESIGN] Mini handheld fan is only the size of the palm. Using a portable folding design, it measures 3.15 x 3.15 x 1.38 inches. Weighing only 5.3 oz, it does not take up much space or add weight when placed in a backpack. It can easily fit in your pocket as well. [LONG-LASTING BATTERY] This portable fan features a built-in 3000mAh rechargeable battery, providing up to 13 hours at low speed, 8 hours at medium speed, and 4 hours at maximum speed. Includes a USB charging cable for convenient charging. The high-capacity battery ensures long-lasting cooling performance. [EMERGENCY POWER BANK] The 3000mAh battery allows the fan to operate for extended periods and also functions as an emergency power bank. The built-in USB output port enables phone charging during critical situations, helping prevent unexpected shutdowns. [POWERFUL & QUIET] Equipped with a high-quality seven-blade fan and brushless motor, this fan delivers strong airflow with minimal noise. Noise levels range from under 15 dB at low speed to only 35 dB at maximum speed, making it quiet enough for use in libraries or quiet environments. [VERSATILITY FAN] This rechargeable personal fan is not limited to handheld use. The folding design allows it to be adjusted to any angle on a flat surface, functioning as a mini desktop fan. With the included lanyard, it can also be worn around the neck for hands-free cooling. 2021 UPGRADED VERSION After extensive research and testing of various handheld fans on the market, this F20 mini portable fan was designed to meet customer needs and aesthetic preferences. Continuous improvements have enhanced its overall performance. New feature: Built-in phone holder allows you to enjoy cool air while using your mobile device. Portability: The compact folding design measures 6.37 x 1.35 inches when folded—about the size of a palm—making it easy to carry in pockets or bags. Practicality: The folding stand enables multiple usage modes including handheld, desktop, and neck-hanging with the included lanyard, offering flexibility for different situations. Durability: Features a 3000mAh rechargeable battery that lasts up to 4 hours at maximum speed and up to 13 hours at low speed. The USB output port supports emergency phone charging. Performance: Powered by a brushless motor and seven-blade fan system, it generates strong airflow with low noise. Three adjustable speed settings suit a variety of cooling needs. Maximum noise level is below 35 decibels, ensuring quiet operation. SPECIFICATIONS: Battery Type: Rechargeable Li-ion battery 3000mAh Input Current: DC5V/1.0A USB Output Power: 5W Charging Time: 4 hours Working Time: 4–13 hours Speed Levels: 3 speeds Speed 1: Up to 13 hours Speed 2: Up to 8 hours Speed 3: Up to 4 hours