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  Book，  Book Pro， or Book Air. Support Mini Display Port 1.1a Dual-mode input. The HDMI can support audio output for   (Late 2009) and   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: Color: Black， White 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 Attention: Size may be slight inaccuracy due to different batches of the products， or hand measurement. Please take real product as standard， thanks for your understanding! 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 Book，  Book Pro， or Book Air. Compatible models: Book Air， Book Pro， and mini with thunderbolt ports since 2011 are all supported. Book Air， Book Pro，and  mini or PC with mini display port are also supported.  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