... slot·Power sources: 1) crank dynamo; 2) computer/USB cable 3) electricity power adapter (not included)Features & Spec.:·USB2.0(Read ... format: MP1,MP2,MP3,WMA,WMV,ASF,WAV·Built-in Battery : Polymer lithium/ 3.7V / 100mAh·Speaker power: 0.25W·Supported operating system: Windows, ... 210 hours(ACT,1G Flash)·Charging time: 30Mins(By Cranking)/3 Hours(By USB)·Using time: Earphone listening(4 Hours)/Lighting ...