Mini DisplayPort to HDMI (Female) Adapter
The new MacBook, MacBook Pro, and MacBook Air each have a Mini DisplayPort that allows you to connect an external display or projector using an adapter. You can use an external display as your main workspace or to extend your desktop, or you can work in mirrored mode with a projector so you can view what your audience sees.
Use the Mini DisplayPort to HDMI Adapter to connect an advanced digital TV or Monitor that includes a HDMI connector.
Review the documentation or check with the manufacturer of your monitor to make sure you're choosing the right adapter.
Specifications
Compatible only with iMac, MacBook, MacBook Pro, and MacBook Air with Mini DisplayPort.
You may also require a HDMI - HDMI cable sold separately.

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