No batteries needed, this crank lantern uses the energy stored to produce light, run an FM Radio, charge a cell phone, and more. 

• can also be charged using a 6V external electrical adapter
• can charge a cell phone
• has a USB tie which can charge an MP3 player
• FM tuner comes with a loudspeaker and earphone output
• Bright LED lights
• Built-in compass

3 minutes of cranking provides 3-6 minutes of mobile phone talk time, 12-16 minutes of MP3 use, or 6-8 minutes of MP4 use.