Unit size :58×30×13.3MM Noble Al casing:Strong metallic touch with wonderful color(gold/rose/blue) File Format:MP3, WMA, WAV Flash Storage:128M/256M/512M/ 1G Earphone Output Power:11mW(L)+11mW(R) FM Radio:87.5MHz-108MHz DC Source:450mAh Rechargeable Li Battery Power consumption:>10Hrs(450mAh Rechargeable Battery) Recorder:Builted in Mic Record Format:MP3 Format Repeat:A-B PC Interface:USB 2.0 Full speed OLED:With many screen protection image Audio Frequency Range:20Hz-20KHz Signal-to-Noise:>88 DB(MP3 ,WMA) Weight:50g Operation temperature:-30°C- 50°C Presetf EQ Setting:Normal/Soft/Rock/Jazz/Classic/POP/DDB