Feature: 1. USB powered, analog output directly inserted into USB port of the computer, eliminating the need for connection. 2. Adopt HIFI level PCM2704 USB decoder chip, its performance is better than most commonly used CM102S series chip in the market. 3. 5V USB power supply, the output can be directly connected to the earphone. 4. Digital output can provide SPDIF digital signals for more advanced DAC decoders for better sound quality. 5. Since it is external sound card, serious electromagnetic interference in the chassis is avoided, and the signal-to-noise ratio and sound quality are improved. 6. PCM2704 can receive 16-bit stereo or mono audio data at 48KHz, 44KHz and 32KHz sampling rates. The chip integrates software volume and mute functions to synchronously adjust the volume and mute of the computer. Specification: Item Type: Mini USB DAC Decoder Board Supply Voltage: 5V (USB powered) Distortion: THD + N: 0.006% (RL > 10kΩ) Distortion : THD + N: 0.025% (RL = 32Ω) SNR: 98dB Dynamic Range: 98dB Earphone Output Power: 12mW (RL = 32Ω) USB Supported Sample Rate: 16BIT/32-48KHZ USB Supported System: For WINXP/WIN7/WIN8, for MACOS9/0SX, for Android 4.1 above (need to support OTG) Package List: 1 x Mini USB DAC Decoder Board