This product is a PCI Express card used to provide a digital signal I/O function on a PC. This product features 16 inputs and 16 open-collector outputs, and has 12 - 24VDC opto-coupler type isolation with an internal 12VDC power supply that does not require external power. 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). Windows/Linux driver is bundled with this product.