The usb2dvipro2 usb to dvi adapter functions as an external graphics card for windows and mac computers the perfect solution for turning your desktop or laptop computer into a dual or multi monitor environment all through the simplicity and convenience of usb the usb dvi adapter delivers high quality video up to 1920x1200 for a variety of applications and is capable of simultaneously running up to five additional displays from a single computer using four usb2dvipro2 external video adapters