- 128/256/512 MB capacity choice, the dynamic choice suits own needed storage space - Supports MP3/WMA music to expand the form of economical file transfers due to good compression rate - Digital recording function (WAV form) to record important conversations if necessary - Supports 15 groups of FM broadcasting stations; listen to your FM group while recording the broadcast program (WAV form) - Provides pedometer, stopwatch and calorie measure to record the individual movement - Language learning function (A-B key reply function), all entertainment learning is suitable - Built-in rechargeable lithium battery for continuous playback of 18 hours - Supports the USB 2.0 high transmission speed, largely saves transmission time - SRS WOW stereo-surround effect for impressive 3D sound environment