Made of ABS material, durable to use. Compact and small size, easy to carry. Plug and play, no need for driver, convenient to use. It extends stereo speaker or earphone to 7.1 channel environment, giving high quality sound enjoyment. Item Name: Audio Sound Card Material: ABS Interface: USB I/O: Analog, Linear Input, Microphone Input, Linear Output (Front), Linear Output (Rear) Sound Channel: 7.1 Sound Support: for DirectSound 3D, for EAX 3.0/EAX 4.0, for Dolby Digital EX Decoding, for Dolby Digital AC-3 Decoding, for Multi Speaker Surround3D Features: External, Portable, Plug and Play Size: 4.5cm x 2.5cm x 1cm/1.77" x 0.98" x 0.39" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 3 x 1 x Audio Sound Card