24 Pin ATX mainboard connector.4 Pin standard drive connectors for HDD and CD-rom CD-RW.4 Pin 3.5” FDD or ZIP connectors.6 Pin AUX power connector (It’s optional by order and may not used by all mainboards.)4 Pin + 12V power connector (It’s optional by order and may not used by all mainboards.)Package size: 7.3*17.4*13 cm.