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 DisplayPort, connect Mac Book, Mac Book Pro, or 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
HDMI/DVI/VGA: 480i/480p,576p,720p,1080i/1080p
Vertical Frequency Range:50/60Hz
Video Amplifier Bandwidth:2.25Gbps/225MHz
External Power Supply: No external power needed
Color: White

Compatible Models:
- Apple MacBook, MacBook Pro, MacBook Air, iMac, Mac mini, Mac Pro - before 2012 version CAN NOT support audio transfer
- Microsoft Surface Pro/Pro 2/Pro 3 for Windows 8 Pro (NOT Surface/Surface 2 for Windows RT)
- Lenovo ThinkPad X1 Carbon, X230/240s, L430/440, L530/540, T430/440, T440s, T440p, T530/540p, W530/540, Helix
- Dell XPS 14/15/17, Latitude E7240/E7440, Precision M3800
- Alienware 14/17/18

Packages:
1 x Mini Display Port Thunderbolt to DVI VGA HDMI Adapter