Function & Feature Charged by sunlight, hand crank and computer USB port FM/AM tuning radio Low power consumption Green LED tuning indicator and blue LED charging indicator Speaker or earphone output Simple outline and delicate appearance Main Technical Parameters:ItemParameterUnitRadio Sensitivity of the FM>10uVSensitivity of the AM>1.5mV/mReception scope of the FM88-108MHzReception scope of the AM530-1650KHzThe audio frequency output power>100mWRadio working time after 1 minute crankingAbout 20MinuteRadio working time after 5 hours charging under sunlightAbout 30MinuteMax. electricity by solar panel charging40mATime to full-charge by solar panel20-30HourRadio working time after being charged fullyAbout 7HourCharged by outside power Input voltage5VFully charged timeAbout 8HourMain parts life-spanSwitch5000TimeThe whole unit5YearThe plastic part5YearOthersDiameter of built-in loudhailerΦ40mmSpecification of built-in battery300mAh, 2.4v