Cheap and convenient, the Archos 18B can play mp3, wav, ogg, avi (converted via the small supplied software. Warning: the software sometimes when plant has several videos to convert). The sound is excellent, the video a little less, but without quibble is nice to watch a movie on the train (or plane for those who love!). Navigation is easy, if slightly boring to organize music or videos. In short, for the price and fun, it's good if it does not necessarily show off with an iPhone overpriced!