Mp3 player Memory capacity: 128m - 1g Usb2.0(full speed) Seven eq modes : pop, classic, disco, jazz , soft, dbb and normal Support mp3, wma, wav, aac , act , adpcm Output power : 2 + 8mw Frequency response range: 40hz - 20khz (1% - 3%) Snr: >= 87 db Record time: 30 hrs (act format), 8hrs (wav format) Fm: optional -support multi languages (simplified/traditional chinese/english/japanese/korean/french/italian/german/spanish/portuguese /dutch) Synchronized words of song display; e-book function; support text file Battery :1 x aaa alkaline battery; Low power design: allows 10-15 hrs of continuous operation; Lcd display with 7 color backlight Color: red\blue\black\silver Dimension:83 x 30 x 22(mm); Attachments: usb data cables / charger / installation disc /instruction / earphone / inner and outer packing. Operating sys: windows 98/me/2000/xp