... fidelity sound. 5.all sizes, colors,models. Letscom battery mp3 player HL40081.good sale!!!2.High quality,low price ... work as MP3 player; 9-hours as mini speakerLi Battery Capacity400mAHBattery Voltage3.7VBattery Charging Voltage4.2~5VBattery Charging TimeAbout ... Support DevicesAbout Letscom:Established in 2000, Letscom is a China manufacturer, supplier and exporter, which specializes in developing, ...