Technique parameter1: (1) The work electric voltage of sum settles: 12V.(2). Work electric voltage scope: 6-13V3.(3). Work electric current scope: 320 Ma (electric voltage is 12Vs)(4). Work temperature: -20-80 °C (5). The scope of the voice presses: 111±3DB(6). Power: 15W(6) Shape size: 90*108 MM (contain shelf).