Worked as described to connect Apple TV over ARC to home theater receiver in a utility cabinet in the garage and a whole house speaker system, although I had to cycle power every few weeks because of lost picture and sound since I received it. After 18 month the unit suddenly stopped transmitting and sound and picture were extremely distorted. Replaced it with a different brand available at Amazon (EZCOOTECH EX70H2) and kept all HDMI cables and IR connections from before and voila - everything works. Hence, this unit I received was just not durable in the long term or had issues all along. Have yet to see how long this new unit will last, but so far has not yet required power cycling it ands keeps stable connection.

The HDMI Cat5 network extender that was installed in a house that I recently bought died. The old system worked fine as a one way with my old 46 in Samsung from 2007, but once the TV was updated to a TCL Roku 65 inches with smart TV. It was very frustrating to not get a return from the TV to the receiver. Fast forward 12 months and the extender died, so I did some research and I found and purchased a new one from AV Access with HDMI 2.0 ARC extender (model 4KEX70-ARC-H2) here on Amazon.I was crossing my fingers as the sole reason to purchase this one was ARC and 4K return. I checked all the reviews and this one seemed to be the unit to purchase. My installation was typical and the distance between the transmitter and the receiver was well within the limits.As I mentioned, my goal was to get it to work with a typical installation (BluRay sending signal to the TLC Rody TV and the TV sending the signal back to the AV Yamaha RX-V575). I did upgrade the HDMI cables to 2.0 for the return. All new cables and the receiver and transmitter so the installation was supposed to be a breeze. And for the most part it was a very straight forward. The extender to the TV worked great seeing in 4K Terminator 2, with phenomenal sound and video. No interruptions or flickering.The challenge came with the ARC return back to the AV. Initially, it only worked for 3 seconds, and then stopped and the audio went completely silent. I checked the receiver following all the instructions and making sure the ARC was on. I unplugged the HDMI cable out of the TV, the TV speakers worked, and then, when I plug the HDMI cable the sound sounds in the AV speakers for a couple of seconds before it went silent again. I tried with Disney+, Hulu, Amazon video, Vudu, and all had the same issue. For some reason, the TV was trying to send a signal that was not being picked up by the receiver. I was able to control the TV audio sound from the receiver by turning ARC off (sound came out of the TV speakers but not 5.1 surround) and off (no sound coming out the 5.1 surround).It turns out that my TCL Roku TV was set-up in Auto for the CEC-ARC return. It turns out that after an update, the only option that sends the return sound is PCM-Stereo. This is interesting because after making the adjustment to PCM-Stereo, I receive full sound 5.1 from my Roku smart TV when I stream back to the receiver using all the different smart apps (Amazon Prime Video, Disney +, Hulu, etc). I was concerned about the quality of the cat 5 cable, because mine is cat 5 and not cat5e or all the above.You can get a cheaper extender if you do not want 4K or ARC, so I was really concerned about not getting all the features working (you can get a cheaper version for less features). However, like other posts mentioned the email support from this company is top notch. I sent them an email Sunday morning and I got a response Sunday evening by Ryan at ryan@avaccess.com or services@avaccess.com. Luckily, I had already solved the problem so I sent them an email back. They told me that the product has a 12 month guarantee and customer support so should not worry. So far, I am very happy with the sound that the TV is sending back to the receiver. I can fully utilize the 5.1 surround system that was built in the house and the quality is way superior to the TV speakers. I would definitely give a chance to the products by AV access. If it does not work with your current configuration the customer support will try to help you very quickly and if it does not work with your hardware, or it is faulty, you can always return it.------------------------------EquipmentTV: TCL 65" Class 6-Series 4K UHD Dolby Vision HDR Roku Smart TVAV Receiver: Yamaha RX-V575Blu Ray: Sony UBP-X700 4K Ultra High Definition 3D Blu-Ray PlayerHDMI cables: Zeskit CinemaPlus High Speed 22.28Gbps HDMI 2.0b

Great product that solved my unique use case!I used this extender to connect my TV on my covered porch to ceiling speakers powered by a Sonos AMP located in my basement (over 75' away). This setup outputs audio from the TV (via Cat6 and the extender) so that my porch ceiling speakers are essentially a soundbar for my outdoor TV. Works great and this is the only solution I could find that would solve this particular use case. Using this setup, I can watch a game on the porch and group the audio to all the other Sonos zones in my house so I never miss the action when taking a bio break! I also only need a single remote control for volume on the outdoor TV since it uses ARC (Audio Return Channel).Setup DetailsAn HDMI cable goes from the HDMI ARC port on my TV to the transmitter extender. I mounted the extender behind the TV using the included brackets for a more secure installation. The transmitter extender also has a cat 6 cable connected that is run back into the house to the receiver extender located in my network closet. The final connection is an HDMI connector from the receiver extender to the Sonos Amp to complete the loop. The receiver extender also has the power plugged in. See attached diagram for more details on the setup.Pros- Supports ARC (Audio Return Channel) unlike many of the other HDMI extenders out there. I tried a few :)- One power cable with flexibility to put it on either receiver or transmitter- Truly plug and play. Connect the approrpiate cables and make sure the dip switch is set to ARC and you are done.- Mounting brackets are included which make installation a breeze if you want to secure attach the extenders at each location.Cons- Cost. Would love if they offered a ARC only device for less money. I don't need the IR extender or any of the other features to solve my specific use case.

I bought an older home which had every kind of wire run behind the TV except HDMI. I was dreading having to fish a new HDMI up over the mantel and repair the Sheetrock.One of the wires I found behind the TV was an old CAT5 cable that was not being used. So, I popped Ethernet terminators on the cable and ordered up these boxes. I plugged them in and boom, works immediately.Great picture and sound from my cable box and 4K Apple TV.The best part is, I was able to relocate ALL of my video components to my basement and control them remotely with a Harmony Elite.I do occasionally get some artifacting/pixelation when watching TV via my Xfinity cable box. It’s not too bad. This is probably because I’m not using CAT5e or CAT6 cable as they recommend. But, I’ll take that over fishing a new wire for now.