Support AES / EBU, IEC60958, S / PDIF; hardware support 7.1 5.1 channel , up to 48KHz sampling rate; Support Win98 / ME / 2000 / XP / MAC OS9.1 (MAC can only use 2 channels); Support full-duplex audio playback and recording of PC silent card; Compatible with USB 1.1 Compatible with audio equipment V1.0 Support USB 12M serial data transmiion; 3 input terminals 3 output terminals Plug and play Suitable for HTPC home theatre Specifications: Color: black Item: Optical fiber Sound Card Support digital recording specifications: 32KHz, 44KHz and 48KHz sampling rate; Support AES / EBU, IEC60958, S / PDIF; hardware support 5.1 7.1channel , up to 48KHz sampling rate; Compatible with USB 1.1 Compatible with audio equipment V1.0 Support USB 12M serial data transmiion; 3 output terminals 1 * Optical fiber sound card 1 * data cable 1 * CD if you need the retail packing(the shipping fee will be more), please tell us. we will change the price before you pay for it.