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 The following Mac/Apple computers support audio pass-through via Mini DisplayPort. MacBook 13" Model 7,1 (Mid 2010) MacBook Pro 13" Model 7,1 (Mid 2010) MacBook Pro 15" Model 6,2 (Mid 2010) MacBook Pro 17" Model 6,1 (Mid 2010) MacBook Pro 13" Model 8,1 (Early 2011 / Thunderbolt) MacBook Pro 15" Model 8,2 (Early 2011 / Thunderbolt) MacBook Pro 17" Model 8,3 (Early 2011 / Thunderbolt) MacBook Air 11" Model 3,1 (Late 2010) MacBook Air 13" Model 3,2 (Late 2010) Mac mini Model 4,1 (Mid 2010) iMac 27" Model 10,1 (Late 2009) iMac 27" Model 11,1 (Late 2009) iMac 21.5" Model 11,2 (Mid 2010) iMac 27" Model 11,3 (Mid 2010) Mac Pro Model 5,1 (Mid 2010) Description: 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. Note:  please make sure that your Mac has mini DP port or Thunderbolt port Only one of the 3 outputs could be used at a time, you cannot use all of them simultaneously Features: 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. Specification: Input Signal:Mini Display Port 1.1a Output Video:HDMI/DVI/VGA Input: Mini Display Port Male 20pin Output: HDMI Female Type A 19pin Connector:DVI Female (24+1) VGA Female 15Pin Vertical Frequency Range:50/60Hz Video Amplifier Bandwidth:2.25Gbps/225MHz HDMI/DVI/VGA:480i/480p,576p,720p,1080i/1080p External Power Supply:No external power needed Power consumption (Max):700mW The Length of the cable:28cm Color:snowy white Package weight:1.9 oz/54g How to use it: The product is easily and conveniently use, with three output ports:DVI VGA HDMI and a Mini Display Port.And you can use one of them at a time as your demand, when you want to use the DVI output, you just need to 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. When you want to use the VGA output, you just need yo connect the VGA devices using a VGA cable.The Mini Display Port meed to connect Mac Book, Mac Book Pro, or Mac Book Air. What is included: 1 x Mini Display Port Thunderbolt to DVI VGA HDMI Adapter cable