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This Mini DisplayPort to VGA Adapter lets you connect a standard VGA monitor, projector, or LCD to Apple MacBook, MacBook Pro, MacBook Air, iMac, Mac Mini, Mac Pro and Microsoft surface Pro with a Mini DisplayPort. You can use an external display as your main workspace or to extend your desktop, Also you can work in mirrored mode with a projector so you can view on your screen what your audience sees. *** Video Setup Instruction for MacBook *** In System Preferences, select Displays. Click the Arrangement tab. Check Mirror Display option. Our product uses the same chipset as Apple's Mini DisplayPort to VGA Adapter Cable found at the Apple store. If our cable isn't working properly with your device, please try the following solutions: Make sure you are using the latest Apple OS. Please check and download the latest Apple OS from the Apple web site. Download "Mini DisplayPort to VGA Firmware Update v1.0" from the Apple Support web site. You can search it on Google and find the link to download. This firmware update addresses intermittent flickering and compatibility issues such as no video on some external displays when using the Mini DisplayPort to VGA Adapter on your Mini DisplayPort or Thunderbolt enabled Mac. Make sure you are using a high quality Super VGA cable, not a standard VGA cable. ** For MacBook Pro (Mid 2012) and MacBook Air (Mid 2012) users: Please download the software update: "MacBook Pro (Mid 2012) Software Update 1.0" , "MacBook Air (Mid 2012) Software Update 1.0" from Apple Support web site. These updates fix external display support. This Mini DisplayPort to VGA Adapter is also compatible with other non-Apple notebooks with Mini DisplayPort, such as Microsoft Surface Pro for Windows 8, HP Envy 14/17, Dell XPS 14/15/17, Lenovo ThinkPad notebooks with Mini DisplayPort.