... a bike for leisure,night lighting standby power supply,external headphone,alarm whistle,flash help,sound and other high-power ... all types of music files, both speaker and headphones. *Mp3 speaker featuresMp3 playback without headphones are inserted, the machine can ... (Signal Noise Ration) 85DbDistortion 0.10%SNR 45DbMP1,MP2,MP3,WMA,WMV,ASF,MAVOperating temperature 5 To 40 degrees CelsiusElectric ...