The included AAA battery had a duration of about 12 hours and even with my elderly batteries to get a good week (two daily bus rides of one hour plus occasional use). For battery life, there is a very good.
The sound quality leaves nothing to be desired, at least until you hear 'normal' MP3s with 'normal' headphones. Supports also is also WMA. I had to make any compromises. Is somewhat disadvantageous perhaps the volume control in 32 steps, I would prefer a dimmer control. Level 32 is very loud, and thus the player itself is in a bus crammed to the brim with young children is no problem use. Sometimes I wish, however, Level 1 would actually stage 3, because if it were quiet even a bit quieter. Therefore, for the sound a good.
The operation is slightly out of hand, even though the small control button is a bit too short to be really easy to operate. On the other hand, it ensures that the device does not become independent in his pocket. A bit annoying: you sometimes press twice for when the blue backlight is also the key to disable it, which will be reversed by pressing or moving the control knob. The advantage of this: an additional protection against high-handed switching, even in jeans pocket. A key lock, there are of course still. The switch, however, is a little stiff and not as easy to reach as the operating button.
The menu is intuitive to operate. For me was the new folder display. (My old player was five years old) In addition to the Play mode Normal, Repeat song, Repeat all and Shuffle there is the possibility of only one folder to play (again, normal, repeat, or random). Individual folders and songs can be selected via the menu. Here, the compactness of the player (a definite plus in fact) adversely affects, because of the non-alphabetical title list you can see only two songs, and even the beginning of the title. But who knows every song on the stick here has no recognition problems.
The display itself disclosed in Normal display the title (ID3 tag with title, artist and album), the file format (MP3, WMA), the title number (eg 065/131), a symbol indicating that whether play, pause or stop active is the elapsed time (not the total length of the song), the battery level, the equalizer mode (which there are six: Normal, Pop, Rock, Classical, Jazz and Bass), the playback mode and the volume level - all very compact and not in TV format as the iPod and its imitators.
The player can do everything a MP3 player must be able to, and in very good quality. I can only recommend the little prodigy!