1、You can easily convert the digital audio signal input from the coaxial or optical interface into an analog stereo audio signal with an RCA interface and a 5 mm headphone jack. 2、The built-in professional audio amplifier chip and volume adjustment knob can directly drive the headphones and adjust the volume. 3、The bass adjustment function can provide powerful stereo, heavy bass effects, and create a perfect environment different from the sound field. 4、Eliminate noise when there is no input signal, and automatically mute it when a non‑audio signal is input. Support 192kHz 24bit sampling rate. 5、RCA output interface is connected to the power amplifier system. A channel 5mm audio output interface, connected to headphones. 1 x DAC Converter1 x User Manual1 x Power Cable1 x For Toslink Cable1 x USB Data Cable Item Type: DAC ConverterMaterial: MetalSupport Audio Format: PCMResolution (1KHZ): 94DBResponse Frequency: 20Hz-20KHz- 0.2dbSignal-to-Noise Ratio (SNR): -100DBTotal Harmonic Distortion (THD + N): 10Hz-20KHz 0.25- 0.065%Blocked Time: 0.577FsSampling Rate: 32-192 KHzBit Rate: 16-24 bitsHeadphone Output Level (Adjust the Bass to the Maximum): 3VRCA Output Level (Adjust the Bass to the Maximum): 9VHeadphone Output Power (Adjust the Bass to the Maximum): (32Ω) 30mWHeadphone Output Impedance: 0.8ΩRCA Output Impedance: 450ΩWorking Voltage: + 5VMaximum Voltage: + 6VMaximum Power Consumption: 75mAWorking Temperature Range: -10-70℃Storage Temperature Range: -60-150℃Working Humidity Range: 10-80%RH (non-condensing)Storage Humidity Range: 5-90%RH (non-condensing)How to Use: 1. Use optical cable or coaxial cable to connect CD/DVD and other playback devices to optical interface or coaxial interface. Use a USB cable to connect the laptop to the USB port.Note: Do not connect a USB flash drive to this USB port. 2. Use RCA cable or 3.5mm audio cable to connect the decoder to the audio amplifier or headphones. 3. Use a USB cable to connect the DC 5V power connector of the decoder to the power source. 4. Use the knob to adjust the volume appropriately. 5. According to your preference, adjust the bass component appropriately through the knob.