Features:play mmc/ sd card stored in mp3/wma files;connect with computer reads， written to the file to mmc/sd/tf(need to match card sets)cards，applicable card reader function' 3.5mm audio input general port， and can be used for other audio equipment headsets use;high quality speaker and sound cavity design， ensure high fidelity， cd quality effect;rechargeable batter， convenient and practical;support the computer system: windows， win 2000， win xp， win vista; the usb interface: high speed usb 2.0;support the memory card: mmc card， sd card， (need sd card adapter);support card capacity: 16GB; support music file format: mp3， wma;support audio sampling Production size:17.5*2+15cm