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「8603 - EMTECH Linux Disk On Module (DOM)」 Contains the software need to run the 8606 or 8608 DVR card. Linux Based software for superior stability and reliability. 「GPIO - EMTECH Linux GPIO Interface Card」 The dongle need to enable a DI/DO interface to your 8604 system. This unit is now obsolete with the new model of 8606 but spares will be available for older model users. 「GPIO-C - EMTECH Linux GPIO Interface Cable」 The cable need to enable a DI/DO interface to your 8606 system. This unit is now obsolete with the new model of 8608 but spares will be available for older model users. 「8207 - Extension Card for 8204」 Extension cable for 8204. This unit is require in the case where an extend use of the card. 「8209 - Extension Cable for 7208/8208」 Extension cable for 7208 or 8208 DVR card. This unit is require to make use of the 7208 or 8208 DVR card.