Features: Remove 6.35 to 3.5 adapters, double headphone output; Upgrades the fiber base, optimize board design, and redefine quality and sound. Computer plug and use, no special software required, RCA and double headphone output. USB and optical coaxial S/PDIF input, you can select the input modes. The volume control knob adjusts the headset and RCA output. Headphone amplifier chip TPA6120, OPA2134; With headphone protect circuit, suitable for any headphone 16-250ohms. Stream perfect 24bit/192Hkz low, built-in SA9123L+NE5532+ESS9018K2M DAC chip, such as desktop DAC, headphone amplifier and preamplifier. Specifications: Material: Aluminum Alloy Frequency Response: 10Hz-20Khz0.5dB Headphone impedance: 16ohms to 600ohms Output power: 90mw/600, 180mw/300, 450mw/100, 610mw/62, 910mw/32, 1000mw/16 Headphone amplifier: TPA6120A2+NE5532 DAC Chip: ESS9018K2M USB Chip: SA9123L AMP Chip: LME49720 Type:1/2/3/4 Note: Driver are required to use with Windows 7, please contact us if you need them. Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Set DAC Converter