HDMI Specification HDMI 2.1b feature highlights include:
Higher video resolutions support a range of high resolutions and faster refresh rates including 8K60Hz and 4K120Hz for immersive viewing and smooth fast-action detail. Resolutions up to 10K are also supported for commercial AV, and industrial and specialty usages.
Dynamic HDR support ensures every moment of a video is displayed at its ideal values for depth, detail, brightness, contrast and wider color gamuts—on a scene-by-scene or even a frame-by-frame basis.
Source-Based Tone Mapping (SBTM) is a new HDR feature that allows a portion of the HDR mapping to be performed by the Source device instead of the Display device. SBTM is especially useful in cases where HDR and SDR video or graphics are combined together into a single picture, such as picture-in-picture or a program guide with an integrated video window. SBTM also enables PCs and gaming devices to automatically produce an optimized HDR signal in order to maximize the utilization of the display’s HDR capabilities without manual user configuration of the Source device. 
The Ultra High Speed HDMI Cable supports the 48G bandwidth for uncompressed HDMI 2.1b feature support. The cable also features very low EMI emission and is backwards compatible with earlier versions of the HDMI Specification and can be used with existing HDMI devices.

eARC simplifies connectivity, provides greater ease of use, and supports the most advanced audio formats and highest audio quality. It ensures full compatibility between audio devices and upcoming HDMI 2.1b products.
Enhanced gaming features ensure an added level of smooth and seamless motion and transitions for gaming, movies and video. They include:
Variable Refresh Rate (VRR) reduces or eliminates lag, stutter and frame tearing for more fluid and better detailed gameplay.
Auto Low Latency Mode (ALLM) allows the ideal latency setting to automatically be set allowing for smooth, lag-free and uninterrupted viewing and interactivity.
Quick Frame Transport (QFT) reduces latency for smoother no-lag gaming, and real-time interactive virtual reality.
Quick Media Switching (QMS) for movies and video eliminates the delay that often occurs when a device changes from one HDMI frame rate to another. More Info...
HDMI Cable Power enables active HDMI Cables to be powered directly from the HDMI Connector, without attaching a separate power cable. This makes attaching and using active HDMI Cables as easy as using passive, wired HDMI Cables.

• 5.1.2-ch Dolby Atmos® and DTS: X® playback
• Dolby Atmos Height Virtualization
• Dolby Surround® and DTS® Neural:X upmixing
• HDMI 2.1 features are supported on HDMI inputs 1–3, Main Out, and Sub/Zone 2 Out in Sub Mode output including VRR, ALLM, QFT (Quick Frame Transport), DSC (Display Stream Compression), QMS (Quick Media Switching), and eARC (Main Out).
• Inputs 1-3 support HDMI 2.1 8K/60AB and 4K/120AB. Inputs 4-6 support up HDMI 2.0b 4K/60. Main+Sub output supports simultaneous 8K/60AB and 4K/120AB, and Main+Zone 2 supports 8K/60AB and 4K/60 respectively.
• HDMI Main Out with eARC for encoded HQ audio, Sub/Zone 2 Out with OSD
• Bidirectional Bluetooth® wireless technology Version 4.2 + LE (A2DP v1.2, AVRCP v1.3; RX: SBC/AAC, TX: SBC/Qualcomm® aptX™/apt X HD)
• Dedicated DACs support synced/independent D/A audio distribution in Zone 2 and Zone 3 (including HDMI/SPDIF/NET*6) via Zone 2 and Zone 3 speaker outputs, Zone 2 pre-out, and Zone 3 pre-out
• Share any MAIN audio source to a wireless headphone dock via Zone B line-out
• Phono equalizer (MM) and SACD (Super Audio CD) playback via HDMI (2.8 MHz 2-ch/multichannel)
• AccuReflex™ phase-matching solution for Dolby Atmos-enabled speakers
• Original DSP-based Vocal Enhancer clarifies in-program vocals/dialog