This document summarizes a solar DC fan that provides 5-6 hours of backup power daily from its integrated battery. It comes with a 12V 12W solar panel, 15W DC motor, charge controller, and battery protection. To use it, the solar panel should be installed on a roof or water tank to charge the battery during the day as indicated by the green light. It takes 2-3 days of charging for a new unit. The fan will stop if the red light indicates a low battery.