Unit size:50*80.9*8.5 mm(Golden section proportion ，Ultra- slim) Noble Al casing: Strong metallic touch with wonderful color 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) Record Format:WAV Format Recorder:Builted in Mic and line In Repeat:A-B PC Interface:USB 2.0 Full speed LCD /OLED:Wide Display With EL Back light&OLEDas Alternative Audio Frequency Range:20Hz-20KHz Signal-to-Noise:>90DB (MP3 ,WMA) Weight:50g(excluding battery) Operation temperature:-30癈- 50癈 Preset EQ Setting:Normal/Soft/Rock/Jazz/Classic/POP/DDB