... hand-power -- about 8 hoursBuild-in speaker dia. -- Φ40mmBuild-in battery spec.-- 300mAh,2.4V Spec. -- 130*73*41mm, NW -- ... : Charged by sun and hand-cranked,never needs fix battery,rechargeable battery store energy, green environment-friendly,economical,safe,recyclable, radio ... work under the sun if the battery without energy .the power LED indicator is bule when battery is in charging proces, long ...