The Detachable Portable Air Cooler Fan is equipped with a dual water tank, providing a total capacity of 10 L. It cools air by evaporating water, which is then recirculated through the three-sided honeycomb water curtains and returned to the tank, minimizing water usage and refill frequency. The actual refill intervals may vary depending on usage duration, fan speed, and humidity levels. If the system detects a low water level, the cooling indicator light will flash to alert the user.