... Amplifier,power amplifier, 2Fully integrated solution,USB/SD Card Insert 3Subwoofer output 4FM radio,led display FM Boat Hi-Fi Audio Stereo 4 ... Channel AmplifierBrand new Mini Hi-Fi Stereo Amplifier for cars, motorcycles ... Feature1 Automatic storage digital,digital display2 Professional automotive amplifier output, BTL integration, HI - FI effect ... -Fi Audio Stereo 4 Channel Amplifier