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.

Specifications:
Color: Black
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

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.

Compatible models:
Mac Book Air, Mac Book Pro, iMac, and Mac mini with thunderbolt ports since 2011 are all supported.
Mac Book Air, Mac Book Pro, iMac, and Mac mini or PC with mini display port are also supported.
MS Microsoft surface pro 3 2 1
Note: You should assure that if your Mac has one of the following two kinds of port : mini DP port and Thunderbolt port

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

• Function:Support HDMI, DVI or VGA input port You can connect the display to one of HDMI/DVI/VGA output ports(Only one of the 3 outputs could be used at a time, you cannot use all of them simultaneously)
• Compatible:The adapter support HDMI, DVI or VGA input port, seamlessly connect Mac Book, Mac Book Pro, or Mac Book Air with a Mini display port to high definition displays.Three different ports meet your different needs
• Input: Mini Display Port Male 20pin; Output: HDMI Female Type A 19pin; Connector:DVI Female (24+1) VGA Female 15Pin
• Power:supports plug and play, and no external power needed.
• What you get:1 x Mini DisplayPort (Thunderbolt) to DVI VGA HDMI Adapter

Function:Support HDMI, DVI or VGA input port You can connect the display to one of HDMI/DVI/VGA output ports(Only one of the 3 outputs could be used at a time, you cannot use all of them simultaneously)Leedemore