This product is an USB2.0-compliant digital I/O unit that extends the input function of digital signal from the USB port of PC and output signals to SPDT relay contacts. This product is compatible with input digital signals at 12 - 24VDC which features 8 channels of Optocoupler isolated inputs (compatible with current sink output/current source output) and 8 channels of SPDT relay outputs with independent common. Compact design not restricting installation location (188.0(W) x 78.0(D) x 30.5(H)) makes it easy to install the product within the panel or device using DIN rail mounting jigs, or on the floor or wall. Windows driver library is supplied. Possible to be used as a data recording device for LabVIEW, with dedicated libraries.