Kaito Emergency Am/fm Radio with Flashlight, KA006 Built-in crank on the front of the radio to charge the internal batteries Five minutes of cranking provides up to one hour of listening (depending on volume level) An optional power supply can be used to charge the batteries when electrical power is available You can also operate the radio and light by inserting two size "AA" batteries (not included) 90 days money back and 1 year limited warranty