Feature: 4-channel power amplifier Support USB/SD/AUX input LED light changes with the volume Bass and treble adjustment Aluminum alloy shell can better protect the machine Description: Power Amplifier Type:HIFI Power AmplifierType: 4-Channel AmplifierModel: BT 998Material: aluminum alloy + plasticRated Power:45WX4Peak power: 200wx4Impedance: 4-16 ohmDistortion rate: 0.4%Resolution: 47kSignal to noise ratio: -95dbRated voltage: DC12vColor: Black Package Included: 1 * Power Amplifier1 * Remote Control(No power)1 * Instructions