From Mini DisplayPort source to HDMI display, here's the only cable - the only piece - you need.

For the simplest and most discreet installation, this Mini DisplayPort to HDMI cable connects your Mini DisplayPort video source to the HDMI port on your display. It doesn't need a power source, unlike some converter dongles that require active power and separate bulky video cabling. This cable lets you enjoy movies on a big-screen HDTV, extend your desktop to a second monitor (up to 1080p) for an expanded workspace or show presentations on a projector at school or work without needing any other adapter or converter.