It can support full HD at 1080p. Note: As of April 13, 2010- Apple added support for audio out using Mini DisplayPort in their MacBook Pro product line. This added feature allows users to easily connect their Macbook Pros to their HDTVs using a cable adapting Mini DisplayPort to HDMI with full audio and video functionality. Please make sure your MacBook pro was manufactured after this date. 

HDMI v1.3 compliant supporting Full HD display at 1080P Supports Mini DisplayPort 1.1a input and HDMI 1.3b output and HDMI225 MHz / 2.25 Gbps per channel (6.75Gbps all channel) bandwidth Supports HDMI 12 bit per channel (36 bit all channel) deep color Support both uncompressed audio such as LPCM and compressed audio such as DTS Digital, Dolby Digital (including DTS-HD and Dolby True HD) Compact design allows unobstructed adjacent port access. Powered from Mini DisplayPort source Please make sure your Macbook supports audio output via Mini DisplayPort. Apple released its new Macbook Pro at the end of April, 2010 with new Mini DisplayPort which transmits audio signal. If your Macbook was made before that, its Mini DisplayPort does not transmit audio signal. After Plugging in the Adapter, Navigate to: System preferences -> Sound, and select your Audio output Device. Thunderbolt compatible - Video/Audio will pass through Thunderbolt port 

Package Include: 1 x Mini Display Port to HDMI Adapter