1. The main circuit of electrolytic capacitor signal adopts for Hongpao , and the capacitor adopts special capacitor to strong and continuous . 2. The resistor adopts five-ring metal resistor, and the main circuit adopts high-precision chip resistor, which ensures a good signal-to-noise ratio of the whole machine. 3. Gold-plated plug-in socket 4. The operational amplifier adopts JRC5532 with better effect USB adopts XMOS208 chip, decoding adopts ES9038Q2M Voltage:DC12V (with 100V-240VAC to 12VDC adapter) Input support:USB:PCM44.1k-384k 32bit/DSD64, DSD128 Color: Black Material: Aluminum Alloy Package Contents: 1 x Audio decoder 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.