The monitors may come with VGA or DVI cables but the HDMI is the standard connection for most office dual monitor setups. The VGA can work easily with a laptop to monitor connection, especially with a Mac. Before you go about setting everything up, position your monitors on your desk.
Can you split a HDMI signal to two monitors?
HDMI splitters (and graphics cards) can send video output to two HDMI monitors at the same time. But not just any splitter will do; you need one that works well for the least amount of money.
Can you connect a second monitor through USB?
One solution, is to add a USB powered monitor. Setup is just like the USB monitor: install the software, plug in the monitor into the case (some manufacturers supply VGA, DVI, or HDM adapters), plug the USB cable into an available USB port on the computer, configure the software, and your second monitor is ready to go.