Exterior: Square(super slim) Dimension: 75*53*10mm Built-in 23MB--128MB flash memory Record/repeat: The record can be repeated and phonetic teaching materials can be downloaded Remote controller El back lighting(blue) Power supply: rechargeable battery, for 5 hours playing time ACCESSORIES: Earphone USB support software CD-ROM USB interface line Rechargeable batteries Electric recharge adaptor Audio cable User's manual KEY SPECIFICATIONS: High quality Aluminium Magnesium alloy case, super slim. Capacity: Built in 128/256MB I/O interface: USB1.1 Read/Write speed: Read 900Kbpsrite 600Kbpsa Support: MP3MAAV Record Format: ADPCM（compatible with WAV） Record time: 500Minutes（128M） Repeat: A-B FM Radio: 87.5～108MHz＃?0 channel） Battery: Built-in rechargeable Li-ion battery (9 hours playback) Charged by: Computer USB or wall charger Dimension: 92mm×33.5mm×12mm Weight: 41g（with Battery）