A great gift for the on-the-go audiophile in your life, this radio requires no batteries—just use the hand crank or solar panel to power it up. It lasts up to 30 minutes from five hours of sunlight or one minute of cranking. 4.1″w x 3.1″d x 7.8″h. 5 hours of sunlight or 1 minute of cranking provides 30 minutes of radio time. AM/FM/WB frequencies.