Mini DisplayPort Thunderbolt to DVI VGA HDMI Adapter cable 3 in1 F MacBook iMac
The HDMI can support audio output for iMac (Late 2009) and Mac Book Pro (Mid 2010). DVI output, connect the DVI devices using a DVI cable. And when you want to use the HDMI output, you just need to connect the HDMI devices using a HDMI cable.