Thunderbolt Mini DisplayPort to VGA HDMI DVI Adapter for MacBook Air Pro iMac UK
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.