Gama Sonic Rechargeable 15-Inch Cooling Fan with AM/FM Radio #GS-26R Rechargeable oscillating cooling fan, 10" blade AM/FM Radio 2 Speeds (High & Low) AC/DC/Battery Operated. Includes Replaceable Rechargeable Battery (6V/2.5Ah) with option for second battery Duration: Up to 4 hours with a single battery; up to 8 hours with a second battery added.