90分贝。　　4。频率响应:20 HZ-20KHZ; 　　5。供电:180 mah的电池充电。　　6。充电时间:2小时; 　　7。工作时间:超过6小时;

1.Active chip read card/play system;
2. Audiomode, compatible with MP3, WMA, WAV format;
3. S/N  ratio: > 90dB;
4. Frequency response: 20HZ-20KHZ;
5. Power supply: 180mah rechargable battery;
6. charging time: 2hours;
7. Working time: more than 6hours;