The usb2vgapro2 usb to vga 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 vga 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 usb2vgapro2 external video adapters