this amplifier is ISO and CE certificated ,Traffic Road safety,Water proof and dust proof ,Live time:more than 100000 hrs

this amplifier Technical Datas is as below:
1.Rated Power20W 
2.Rated Voltage: 12V
3.Rated Impedance:4Ω,8Ω   
4.Frequency Range: 550-5000Hz
5.Sound Pressure:115-120Db 
6.Sound Distortion Factor:≤5%