Features:
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:
DVI output, connect the DVI devices using a DVI cable.
HDMI output, connect the HDMI devices using a HDMI cable.
VGA output, connect the VGA devices using a VGA cable.
Mini Display Port, connect for Mac Book, for Mac Book Pro, or for Mac Book Air.
Support Mini Display Port 1.1a Dual-mode input.
The HDMI can support audio output for iMac (Late 2009) and for Mac Book Pro (Mid 2010)
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.
Automatic detect the display by plugging and unplugging it.
Powered from Mini Display Port source.

Specifications:
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
Total Length: approx. 25cm/9.84 inch

Package included:
1 x Mini Display Port Thunderbolt to DVI VGA HDMI Adapter cable