USB external sound card. Bare board manner, visible material, compact and easy to carry. USB interface, plug and play, instead of traditional sound card (computer sound card is broken, can be a direct replacement). Analog o signals can be output to directly drive headphones or powered speakers. No drivers in WIN2000, WINXP, WIN2003 system. Color: Blue Material: metal Output Input: 3.5mm green headphone jack, 3.5mm microphone jack. Chip models: CM108 external crystal. PCB Board Size: 38 * 7mm / 1.5 * 0.28in (L * W ) Package Contents: 1 x Free driver USB Sound Card Note: Light shooting 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.