First of all, mp3 can only play music and import some listening materials, but it can't read TXT files.
MP3 recommendation: cheap; Cute screenless sports MP3 player only needs 35-50 yuan as long as you have heard enough.
Chinese: MP3 Blue Devils Q23 Music Club Q23 MP3 4G MP3 Player 120 yuan.
High-end: Apple/Apple MP3 iPod shuffle6 6th generation 2G MP3 player authentic 300-380 yuan
MP4 recommendation: cheap: Ziguang Electronics mp4 8g touch screen HD genuine licensed outbound package Touch special price is about 4.3 120 yuan.
Chinese: Taipower C700SP 8G 7 inch high-definition touch screen MP4 touch+ buttons high-definition MP5 small digital 300 yuan around this is very hot!
High-end: Philips MP4 player SA4VD4 (video) 4G 4.3 inch HD MP4 300 to 360.
I hope I can help you, and I hope to adopt it!