1. One optical and one coaxial input interface. Connect to DVD, HD player and other devices 2. An RCA output interface, connected to the power amplifier system 3. A channel 3.5mm audio output interface for connecting earphones. 4. Eliminate noise when there is no input signal, and automatically mute when there is no audio signal input. Support 192KHz 24bit sampling rate 5. Support volume adjustment, support bass adjustment 6. Metal shell, anti-interference