Product selling point: 1: Wide range of applications 2: Simple to use 3: Small size, easy to carry 4: Dual channel 5: stable performance Product Name: Digital Audio Amplifier Board Amplification Type: Class D Chip selection: domestic chip Supply voltage: DC10-24V input Current: 4A recommended Output power: 2*40W Frequency Response Range: 35Hz-88KHz Number of channels: two channels Impedance matching: 4-8 ohms Please check carefully before powering on to make sure the wiring is correct.Package Included: 1* Digital power amplifier board