Mini Display port the adapter can seamlessly connect Mac Book, Mac Book Pro, or Mac Book Air with a Mini display port to high definition displays. Support HDMI, DVI or VGA input port you can connect the display to one of HDMI/DVI/VGA output ports. Support audio output. When connecting the iMac (Late 2009) and Mac Book Pro (Mid 2010) to HDMI display, please set "Sound" on the dialog box of "System Preferences" to get audio output. So buy this product and Save $69 on a VicTsing Gold Plated Mini Display Port for $10.99 after instant rebate with free shipping at Rakuten.com.