Service Support: If there are any issues with FURUI Fiber Optic HDMI 2.1 Cable, we will provide after-sales service support. ^^ 8K@60Hz & 4K@120HzThe FURUI 8K fiber optic HDMI cable support long distance at 8K@60Hz, 4K@60Hz/120Hz & up to 10K resolution. No signal loss. Compatible with Dolby Atmos, Dolby Vision, HDCP 2.2 & 2.3, DTS: X, Dynamic HDR, BT. 2020, eARC, ALLM, QFT, QMS, VRR. Backward compatible with earlier versions of HDMI. If you need higher refresh rate (like, 4K@120Hz) please make sure your device support it. please make sure your device (player, video, tv, etc) support 8K. ^^ Hyper Speed 48GbpsThis HDMI 2.1 fiber optic cable support ultra high speed 48Gbps. Multi-transfer will result in HDMI signal loss. This type of fiber HDMI 2.1 cable is very thin and flexible, OD 0.189 inch ( 4.8 mm). TPE Jacket. Plug and play, no external power needed. ^^ One-way TransmissionOptical HDMI 2.1 cable is one-way transmission "SOURCE" plug for connecting HDMI source(Blu-ray, STBox etc. ) DISPLAY plug for connecting your HDMI display device(TV, cinema projector, etc. ) ^^ Wide CompatibilityOur 8k fiber HDMI cable is compatible with Nvidia RTX 3080/3090, Xbox Series X, PS5/4, Denon AV Receiver, LG / Samsung / Sony / TV, Xbox One X and more.