This Velleman 8-Channel USB Relay Card Kit comes with eight relay channels controlled by your computer! Use your computer USB port to connect to the outside world. The K8090 relay card can connect up to 16A to each of the high power relays. There is lots of board space for extra VDR noise suppressors is provided and on board push buttons can be used to test/operate all the relays. A dll for own software development can be downloaded from our web site. Test software completes the package.