1.Wide range AC/DC power supply;

2.Mp3/WMA/WAV decoded with clear voice output;

3.SD /SDHC card storage;

4.Play voice controlled by rs232 ,buttons and keyboard;

5.Maximal support 20 buttons play one by one;

6.Support AUX Line-in;

7.Stereo amplifier output for external speaker;

8.Voice can be record by microphone and AUX Line-in;

9.Volume is adjusted by knob;

10.Relay output, the relay closed when playing music;

11.LED indicator during play.