First, the USB cable used to connect the U316 must be a Type-C data cable or a Type-C OTG cable; a charging cable cannot be used Second, the U316 does not require additional software installation to connect to a mobile phone or computer. Connecting to a computer requires for 10 or later. Playing DSD files on a computer requires the ASIO driver, which can be obtained from customer service. Playing DSD files on a mobile phone requires Hiby Player Third, the AUX output port is for convenient use with a 3.5AUX cable, but it is not suitable for directly driving headphones The coupling capacitors are 's high-end BP non- capacitors, full of character. The filters are also high-end capacitors, ensuring low ripple and a clean sound. The LPF circuit uses through-hole JRC5532 op-amps, facilitating upgrades to higher-end op-amps. Model:U316 Input:USB Outputs:include one cable and a 3.5mm headphone jack. Working voltage:USB 5V digital interface:XMOS316 Decoding chip:ES9039Q2M Decoding parameters:DSD64-512,PCM 32-bit 768K (WIN10 built-in driver supports 384K) total harmonic distortion: Less than 0.002% signal-to-noise ratio:120DB Frequency response range:20-20K@1KHZ+0.3DB (The product printed words depending on the batch, but this does not affect use) Color: As Shown Material: plastic Package Contents: 1 * Headphone Amplifier Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.