This product is a PCI Express bus-compliant interface card that extends the digital signal I/O functions of a PC. This product is a 12 - 24VDC opto-coupler isolated type with opto-coupler isolated input 16ch and opto-coupler isolated open-collector output 16ch. You can use all of the input signals as interrupt inputs. Equipped with the digital filter function and output transistor protection circuit (surge voltage protection and over current protection). This product supports a Low Profile size slot and, if replaced with the supplied bracket, supports a standard size slot, too.