This product with three output ports, and you can choose one of them to use at a time as you demand, the functions of the port as followings:
1.DVI output, connect the DVI devices using a DVI cable.
2.HDMI output, connect the HDMI devices using a HDMI cable.
3.VGA output, connect the VGA devices using a VGA cable.
4.Mini Display Port, connect Mac Book, Mac Book Pro, or Mac Book Air.
1.Support Mini Display Port 1.1a Dual-mode input.
2.The HDMI can support audio output for iMac (Late 2009) and Mac Book Pro (Mid 2010)
3.Support HDMI/DVI/VGA output with the max resolution of 1920x1080p@60Hz, 225MHz/2.25Gbps per channel (6.75Gbps all channel), 12bit per channel (36bit all channel) deep color.
4.Automatic detect the display by plugging and unplugging it.
5.Powered from Mini Display Port source.