Features: Adopts three-phase brushless generator to crank for power, low noise with high efficiency Ultrabright illumination High sensitive FM radio function, loudspeaker and earphone output, the volume is adjustable Two ways to charge the inside 300mAh or 3.6V Ni-Mh chargeable battery Uses USB tie-in for power output Cranking to charge mobile phone, MP3 and MP4 Controlled by electronic switch, long lifespan Convenient to use, never change battery and just cranking to charge Compass function Novelty, fashionable and exquisite Complete functions External 6V adapter Lighting function: 6 LEDs lighting in power saving mode 6 LEDs lighting in normal condition 6 red LEDs flash function FM radio Warning Compass Specifications: Working time after being charged for one minute Radio time: 13 minutes Warning time: 4 minutes 6 LEDs lighting in power saving mode: 20 minutes 6 LEDs lighting in normal mode: 10 minutes 6 LEDs flashing: 60 minutes Working time after being charged fully: Radio time: 5 hours Warning time: 5 hours 6 LEDs lighting in power-saving mode: 3.5 hours 6 LEDs lighting in normal mode: 2 hours 6 LEDs flashing: 20 hours Flash frequency: 2Hz Receive scope of FM radio 87 to 108 or 76 to 91MHz Switch lifetime: 10,000 times Plastic part lifetime: 5 years LED lifetime: 50,000 hours Whole unit lifetime: 5 years 3 minutes cranking can make mobile phone talk for 2 to 28 minutes 3 minutes cranking can make MP3 work for 10 to 20 minutes 3 minutes cranking can make MP4 work for 4 to 10 minutes Time of being charged fully by external 6V adapters: 4 to 5 hours