1. Using double 9038q2m for left-right channel decoding brings higher separation and low distortion 2. The USB part uses a high-digit digital isolation IC to reduce the noise introduced by the USB power supply and ground wire 3. Dual power supply, digital analog separate rectifier filter power supply 4. The digital main power supply uses LT1764A fast transient response, low noise voltage regulator IC, 9038q2m uses low noise IC power supply. 5. With digital volume control, support volume adjustment, use TFT screen without burning screen, use for infrared remote control.(remote control not included). The analog part of uses optical and acoustic in-line resistors and in-line capacitors The board supports Bluetooth interface iis input Technical indicators: Sampling rates supported by each input interface: coax:PCM: 44.1KHz,48KHz,88.2KHz,96KHz, 176.4KHz,192KHz,352.8KHz,384KHz DSD:DOP64,DOP128 OPT:PCM: 44.1KHz,48KHz,88.2KHz,96KHz, 176.4KHz,192KHz DSD:DOP64 USB:PCM: 44.1KHz,48KHz,88.2KHz,96KHz, 176.4KHz,192KHz,352.8KHz,384KHz DSD:DSD64,DSD128,DSD256,DSD512 BT IIS:PCM: 44.1KHz,48KHz,88.2KHz,96KHz, 176.4KHz,192KHz,352.8KHz,384KHz DSD:DSD64,DSD128,DSD256,DSD512 Analog output performance: Output level: The has a single-ended output of 2.7V and the XLR has a balanced output of 5V Noise level: (,-112 dB) (XLR,-117 dB) Dynamic range: (,112 dB) (XLR,117 dB) Total harmonic distortion: (,0.0004%) (XLR,0.0004%) Intermodulation distortion: (,0.0014%) (XLR,0.0008%) Stereo separation: (,-108 dB) (XLR,116 dB) Color: Green Material: PCB Package Contents: 1 x Decoder 1 x Screen 1 x cable 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.