Supports Mini Display Port 1.1a input USB (Universal Serial Bus) 2.0 input & HDMI 1.3b output Works by integrating mini Display Port video source & USB (Universal Serial Bus) audio source of the Mac Book into HDMI output Getting the HDMI audio format through special USB (Universal Serial Bus) Audio Decoding Chip Powered from Mini Display Port & USB (Universal Serial Bus) port Supports HDMI 225 M Hz 2.25 Gbps per channel 6.75 Gbps all channel bandwidth Supports HDMI resolution of up to 1080p Supports HDMI 12 bit per channel 36bit all channel deep colour Supports uncompressed 2 channel audio such as LPCM The Mini Display Port USB (Universal Serial Bus) to HDMI adaptor means that you can connect a computer with mini display port & a spare USB (Universal Serial Bus) port to a HDMI device such as HD TV. The mini Display Port transmits the video signal while the USB (Universal Serial Bus) transmits the audio creating a complete HDMI source.