This Mini Display Port to HDMI adapter seamlessly connects both video & audio outputs from Mini Display Port or Thunderbolt-equipped computers to a HDMI display, TV or projector. The built in sound card feeds digital sound directly into the HDMI signal making it ideal to be used with older computers that can't output audio through Mini Display Port. Perfect for watching movies or video from your PC on an HD Plasma or LCD screen. It also means that you can create extra desktop workspace by extending your display on to an HD screen or to improve your multi tasking abilities by mirroring to an additional display. USB power reduces unnecessary cable clutter & gives you a true audio video experience with full HD 1080p video & uncompressed audio support.