Fan Detail. Ventilation Powerful Rechargeable Battery Ceiling Fans. Automatic emergency fan during power failure Voltage: AC220V~240V/DC 12V- 24V, 80 watt. 2PCS Rechargeable battery built in the fan. 5-speed airflow & Remote Control. DC automatic conversion to AC and charging when power available. Both AC and DC workable. Overcharge and over discharge protection. The fan works continuously 4-6hours when the power fails. One red charging indicator & one green full charged indicator. Charged by electricity & solar panel (solar optional). 100% copper & brushless motor. Overcharge and over discharge protection. AC/DC automatic conversion and workable. Minimum 30 years life motors. 70% Energy saving compare AC Motors. 50% Low noise compares AC Motor. Keep Perfect working even in Low voltage. 160% More Airflow then normal AC celling fan. With 5 speed and one off meter indicating remote control.