USB Portable Audio Player, Mobile Phone, Computer Special Feature Portable, Mini Shape Square Card Slot Fit SD / TF Card 1.SD/USB/SMMC Card Music Player,Players can also take the initative2.High -efficiency Digital Power Amplifier ,A Beautiful Pure Sound Quality,Sound Shock People.3.Small Size,Easy to carry for travel,outdoor activities such as Cross-country(Note:During Playback,Sound Anomalies, ...