Smart Battery Desktop Fan with digital display and adjustable wind speeds - Long lasting power: large 5000 mAh battery provides about 12-20 hours of use on a full charge (tests based on wind speed). The built in display shows remaining battery power and current wind speed. - Precise wind control: 100-step wind settings 0-20 sleep wind; 20-40 natural wind; 40-60 refreshing wind; 60-80 strong wind; 80-100 circulation wind. Highest speed 2500 RPM with noise under 30 dB. - Efficient airflow design: ultra wide-angle square-shaped body directs air from all sides for high-speed, even airflow. - Compact and versatile: suitable for office, desktop, bedroom, kitchen, camp, travel and other settings. 2-3 practical use scenarios - Desk/workstation: stay cool through long sessions with steady, controllable airflow and a clear battery level readout. - Nighttime bedside: quiet operation at low speeds for comfortable cooling while sleeping. - Travel or camping: portable power with the 5000 mAh battery supports extended use away from outlets. Technical notes: 5000 mAh battery; runtime approximately 12-20 hours on full charge depending on wind speed; 2500 RPM top speed; noise below 30 dB; 100-speed range with five zones; square wide-angle body for multi-direction airflow.