- Brushless motor and strong airflow: Upgraded brushless motor delivers strong wind power; max wind speed 9 m/s, max speed 10,000 rpm. This portable fan is suitable for travel, exploration, outdoor activities, or cooling at home or in the office. - Long runtime and fast recharge: Built-in 4000mAh battery with energy saving tech provides long-lasting operation. Runs continuously for 2 to 15 hours depending on air speed. Recharge from a regular outlet, a mobile power supply, or any USB port; full charge in about 1.5 hours. - Small yet powerful handheld design: 100 adjustable air speeds let you tailor cooling to your needs, even in 40 degree Celsius heat. Ideal for outdoor use, camping, beach, cruise, vacation, road trips, concerts, and sporting events. - Safe and durable construction: Made from high quality ABS and PC with a metallic surface, comfortable grip. Built-in AI protection chip offers over-current, over-voltage, short-circuit, and high-temperature protections for safer use.