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Description: 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 Mac Book, Mac Book Pro, or Mac Book Air. Specification: Size: 5.7 x 5.7 x 1.5 cm 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 Compatible modes: 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.