... . 4.high fidelity sound. 5.all sizes, colors,models. Letscom mp3 player HL40061.good sale!!!2.High quality,low price.3.accept ... portable speaker,portable audio and so on.1. Work as MP3 player and mini speaker2. SD card storage.3. Audio with high ... , diameter:40mmLine Input3.5 mm ψWorking Time4-hours work as MP3 player; 8-hours as mini speakerLi Battery Capacity400mAHBattery Voltage3.7VBattery Charging ...