?[Use Caution #1] Although this HDMI fiber optic cable supports hot plugging, it is recommended to power off the device for plugging and unplugging. When not shutting down, plug "SOURCE" end first.?[Use Caution #2] In most cases, you can directly replace the original ordinary HDMI cable. For some monitors, turned on enhanced mode or game mode or advanced mode or select HDMI DEEP COLOR. Turn off Dolby Vision first for test.?[Use Caution #3] Change the graphics settings to variable refresh rate if this option is available.?[Use Caution #4] When the TV is connected to the AVR Receiver and cannot work, pls confirm the HDMI cable is connected to the HDMI ARC/eARC port of the receiver, then enable the ARC (eARC) function in TV settings. Note: select the correct input source in the devices settings.?[Exquisite Workmanship] Strict quality inspection standards, fine appearance details, refuse to be shoddy. The overall texture will never let you down. Zinc alloy electroplating highlight shell, the appearance is very beautiful.?[High-Quality Materials] Gold-plated connectors, anti-corrosion, provide better signal transmission performance.?[Lossless Transmission] The most typical feature of fiber optic cables is lossless transmission. The disadvantage is that it is more expensive than a normal hdmi cable. HDMI fiber cable below 5m is not cost-effective. It is also not suitable for occasions where there is no high requirement for the display screen.?[New Features of HDMI Version 2.1]Can carry up to 10K@120fps video signalNew audio and video features: dynamic HDR, enhanced audio return channel eARCNew Game Features: Variable Refresh Rate VRR, Fast Frame Transfer QFT, Automatic Low Latency Mode ALLM, Fast Media SwitchingNew video signal compression format: VEAS DSC 1.2a