specification
       system：12" 2 way active speaker
       input frequency response:（±3db）：20hz-----20khz
       input sensitivity: line(1v)
       s/n rate:    ≥85db
       rated power：  low frequence：150w    4 ohm（20hz-----3khz）
                midlle-high frequence：50w    8 ohm（3khz-----20khz）
      voltage：ac220v/50hz

feature：support mp3/wma/wav format（including variable baud-rate mp3 format）
         support u-disk,sd/mmc card，32g，nice compatibility，document system fat16/fat32
         support sequential play mode
         support single song location and page(10 songs/page ) location
         support volume adjustment, bass and treble adjustment
         suport reading file folder（named 'mp3'）

         mp3 audio baudrate：32kbps-----320kbps
         wma udio baudrate：32kbps-----384kbps
         usb interface：usb2.0  full speed