Mini DisplayPort is simply a smaller version of the DisplayPort, Mini DisplayPort is mainly used on MAC computers but other manufacturers may adopt this type of connector.
The Mini DisplayPort to HDMI adaptor will allow you to connect a high definition monitor, projector or LCD TV to a MacBook, MacBook Pro or a MacBook Air with a Mini DisplayPort connection.
Note: *Audio support is only available for MacBook Pro (Mid 2010 and later), MacBook (Mid 2010 and later), MacBook Air (Late 2010 and later), Mac Mini (Mid 2010 and later) and iMac (Late 2009 and later).
Supports Mini DisplayPort 1.1a and HDMI 1.3b output,
Supports HDMI resolution of 1080p,
Supports HDMI 12-bit per channel (36-bit total) deep colour,
Supports uncompressed audio such LPCM,
Supports compressed audio such as DTS Digital, Dolby,
Digital including DTS-HD and Dolby true HD,
Powered by DisplayPort,
Connector A: Mini Display Port Male,
Connector B: HDMI 19 Pin Female,