USB connection input: two output modes, generally only connected to the analog output interface, the coaxial output is basically not used. Analog output mode: can be connected to amplifier, preamp, active speakers, amp headphones, etc. The switch is selected at the position of A, and the device input line is connected to the analog output interface. USB chip uses pcm2706, with I2S output DAC decoding TDA1305T The input interface is a USB port. After connecting directly to the computer, the driver is automatically installed. After the driver is installed, the original sound card is shielded and easy to use. The output interface is two 3.5mm jacks for reliable contact. One hole can be connected to the front stage and the power amplifier through the 3.5-turn RCA signal line, and the other hole can be inserted into the earphone at the same time, which is convenient and practical. Output level: 1.5V RMS Colour:As Shown Material:plastic Note: The volume is adjusted in the computer (audio player). When using the headphones, please turn down the volume to prevent damage to the headphones! Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. Package Contents: 1 * Decoding board module