1.USB/SD Audio input 2.Play MP3 audio format 3.Digital Display 4.FM Radio.External Audio Input 5.GH-Power BTL Output Input voltage DC12V Frequency response: 20Hz 20KHz Output power: RMS 55W +  55W+ 55W + 55W Harmonic distortion:≤0.05% 4W 1KHz SNR: ≥85dB High control: 12dB ± 10KHz Bass control: 12dB ± 100Hz The signal level: 220MV 47K Reader, u-disk format: MP3, WMA/FM FM FREQUENCY RANGE-----87.5MHz108MH

1000w car amplifier 4ch BK900