Main chip HIFI level PCM2704 USB decoder chip, its performance is the low end of the market's most popular chip CM102S series, uses USB power supply, output can be directly connected to the headset, but also do pre-digital output for more advanced decoder provides SPDIF digital signals to get better sound quality. because it is an external sound card, the chassis to avoid serious electromagnetic interference, signal to noise ratio and sound quality can be improved. PCM2704 is a monolithic digital-analog converter chip. It has two digital-analog converter output channel and an integrated USB interface controller. Interface complies with USB1.1 standard. PCM2704 can receive 48KHz, 44KHz and 32KHz sampling rate, 16-bit stereo or mono audio data integration software within the chip volume and mute function can be synchronized to adjust the volume and mute the computer. USB powered, analog output directly plugged into the computer on the USB port, eliminating the need to connect. Support 16 bit kHz/44.1 kHz/48 kHz Support 2 Channel Analogue Output, S/PDIF output Dynamic Range/signal to noise ratio: 98dB + N = 0.006% USB interface support 1.0 specifications Win XP/Win 7/Win 2000 free drive Win 98SE need to install drive Size: 55x50 mm Specification of PCM2704 : Voltage: 5 V (USB interface), Distortion: + N: 0.006% (RL 10 K) Distortion: + N: 0.025% (RL = 32) Signal to Noise Ratio: 98 dB Dynamic Range: 98 dB Headphone power output: 12 mW (RL = 32) Color: As Shown Material: PC Package Contents: 1 * PCM2704 USB Power Sound Card Decoding Module 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.