As we know‚ conventional Mini DisplayPort of MacBook can only transmit video signal but no audio. 

This adapter works by integrating the mini DisplayPort video source and the USB audio source of into HDMI output through a special USB Audio Decoding Chip. 

It allows users to enjoy perfect image and sound on HDTV. 

End user can connect Mac to a projector‚ view  computer´s display on an HDTV‚ extend  display onto a second monitor‚ and much more. 

Features 

1.Supports Mini DisplayPort 1.1a input‚ USB 2.0 input and HDMI1.3b output.

2.Works by integrating mini DisplayPort video source and USB audio source of the MacBook into HDMI output 

3.Getting the HDMI audio format through special USB Audio Decoding Chip. 

4.Powered from Mini DisplayPort and USB Port. 

5.Supports HDMI 225MHz/2.25Gbps per channel (6.75 Gbps all channel) bandwidth.

6.Supports HDMI resolution of up to 1080p

7.Supports HDMI 12 bit per channel (36 bit all channel) deep color.

8.Supports uncompressed 2 channel audio such as LPCM.