Features: The innovative use design of the OP expansion flow of a single power adapter to dual power supply , the whole adopt virtual ground power supply design, and has a high resistance to noise ratio. Use of 4-layer FR4 high quality heavy gold PCB design, four layer of design offers good line environment for this machine . Headphone design adopt OP+ BUF framework, and Parallel lines will be cut off automaticly after insert headphones . The machine power are not using the computer"s power, all IC externally connect all DC multi-stage regulator. Specifications: Input:USB£¨1.0£©x1. Output terminal: analog RCA 1 group 3.5MM headphone jack x 1 SPDIF OUT x 1. Frequency response: 10HZ --- 20KHZ (-1dB). Distortion AC: 0.01%. Headphone output: 0.05%. Headphone output level: P-Pmax: 6V. Headphone output matching impedance: 32 ohm --- 600 ohm. Line output level: 2Vrms. Input Power: DC9-12V 1000mA. Size: 105mm * 70mm * 25mm. Package Included: 1 x DA10 USB decoder 1 x USB 2.0 Cable 1 x 12V 0.5A power supply adapter