Features:
Mini Display port
The adapter seamlessly connect for Mac Book, for Mac Book Pro, for 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 for iMac (Late 2009) and for Mac Book Pro (Mid 2010) to HDMI display, please set "Sound" on the dialog box of "System Preferences" to get audio output

Note:

Only one of the 3 outputs could be used at a time, you cannot use all of them simultaneously
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 for Mac Book, for Mac Book Pro, for Mac Book Air.

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: Black or white
Package weight: 1.9 oz/54g

Compatible models:
for Mac Book Air, for Mac Book Pro, for iMac, and for Mac mini with thunderbolt ports since 2011 are all supported.
for Mac Book Air, for Mac Book Pro, for iMac, and for Mac mini or PC with mini display port are also supported.

Package include:
1* Adapter