HDMI specification version released on June 2006 that features increased Single-link bandwidth to 340MHz (10.2Gbps), Deep Color billion color support, Dolby TrueHD and DTS-HD Master Audio lossless audio formats, improved lip sync correction, and broader xvYCC color space support (enables 1.8 times as many colors as existing HDTV signals).

The HDMI 1.4 Specification was released in June 2009, and added major enhancements to the HDMI features, including HDMI Ethernet Channel (HEC), Audio Return Channel (ARC), and additional support for 3D and 4K display technologies. It is fully-compatible with all previous HDMI releases.

HDMI Licensing, LLC forbids manufacturers from designating Release Numbers in product descriptions, and requires that specific features supported be listed instead; therefore Gefen products list the features, rather than the release version.

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