One optical fiber and one coaxial input interface. Connect to DVD, HD player and other devices One USB input, connect to computers. One RCA output interface, connected to the power amplifier system One channel 3.5mm audio output interface, Connected to headphones. Eliminate the noise when there is no input signal, and automatically mute when the non-audio signal is input. Support 192kHz 24bit sampling rate. Support volume adjustment Support bass adjustment Metal shell, anti-interference Introduction: This product is specially designed for professional audio signal processing, You can easily convert the digital audio signal of input of coaxial or optical interface to analog stereo audio signal of RCA interface and 3.5 mm headphone jack. The built-in professional audio amplifier chip and volume adjustment knob can directly drive the headphones and adjust volume. The product's bass adjustment function can provide powerful stereo, heavy bass effects, and create a perfect environment different from the sound field. The effect obtained is very obvious, which makes you reveled to the world of bass. Specification: Support Audio Format:PCM Separating Degree(1KHZ):94DB Response Frequency:20Hz-20KHz -0.2db Signal-to-Noise Ratio(SNR):-100DB Total Harmonic Distortion(THD+N):10Hz-20KHz 0.25-0.065% Blocking Time:0.577Fs Sampling Rate:32-192 KHz Bit Rate:16-24 Bit Color:Black Material:Metal Package Contents: 1 x Audio Converter 1 x USB Cable 1 x Fiber Optic Cable 1 x Instructions in Chinese and English