I use it to transfer sound from my laptop to a five-channel amplifier that does not have HDMI inputs but has optical inputs, as it was purchased in 2004.

SOUND
The converter outputs a five-channel digital signal on its optical output when the input is the HDMI of the computer and reproduces five-channel content. The amplifier has a corresponding indicator that lights up when it has a digital five-channel signal input, so there is no doubt that it does what it promises.

IMAGE
The converter outputs 4K at 60Hz on the output.

CONCLUSION
In short, if you have an amplifier without HDMI inputs but with optical inputs, and a playback device that does not have an optical output, this little box is the solution.

P.S.: I could pass the HDMI to the TV, get an optical output from the TV, and pass it to the amplifier.

However, the TV only outputs stereo sound, like most TVs. So, you have an optical digital signal, but it is stereo and not five-channel.

Very good and branded product with very good image and sound quality. I bought it to connect my PS5 to a sound amplifier with optical fiber for digital sound. The other good thing it has is that one HDMI output has a cable with an HDMI connector to connect directly to the source you want, without needing two HDMI cables. So you save the purchase of one of the two cables. The construction deprived it of one star and for this reason I gave it 4. It is made of average quality plastic and not very sturdy, I did not expect this from delock and it is overpriced at the 50€ I bought it, it is definitely not worth the money!

I will take the time to say some things about the related product, as until now no one has done so, and the details are very minimal.

First, let me talk about what interests people. What does this specific product do?
Like all HDMI audio extractors (some of you may know the basic features), you can have the HDMI image connected to a TV or screen and at the same time have audio from an external audio playback device such as an amplifier, PC speakers, soundbar, etc., with an optical audio input.

This product gets 5/5 stars from me for two very basic reasons. Firstly, it comes in a very small size with an integrated HDMI 2.0 in one port (I searched a lot to find out that it is indeed this version of HDMI it has because it is not mentioned anywhere; I had to dig into other websites), so it saves you the trouble of buying additional HDMI cables since it already has one (of course, you need another 2.0 cable to connect to the other end with the screen/TV).
Secondly, it comes in 60Hz for 4K at €50. It is a very good price for 4K resolution at these hertz with an integrated HDMI 2.0, because in Greece it is difficult to find something similar in this size at this price for immediate purchase (if you have the patience to wait for something similar from abroad today... good luck).

Finally, not to bore you, the main reason I bought it is because I am sure that many people will need it for the same purpose. The PlayStation 4 (and Pro) had an optical audio port at the back of the device, but unfortunately, the PlayStation 5 did not have one. So, we couldn't have both image and (quality) sound through an HDMI cable to a TV or screen via speakers, etc. Here comes the HDMI Audio extractor. I have an Aorus 4K screen, I have it connected to my computer with my speakers, but I didn't have sound on the same screen if I had to connect it to the PS5 via optical. With this specific HDMI Audio extractor, I have 4K image at 60Hz (60fps) and sound from my speakers connected via optical audio.
For me, it is the only way to spend this extra money and have much better sound from the speakers on any console connected via HDMI.

I apologize for the long text.
I hope I helped you.

I couldn't give less than 5 stars, it does exactly what it promises, it just doesn't mention basic features here in the description, such as supporting a maximum image quality of 4K@60Hz and 5.1 digital or stereo sound. These should have been mentioned in the title, I had to open dozens of similar products, which mostly have a maximum of 1080p. I use it with a latest generation console and it has 5.1 sound and 4K@60Hz just as it says.

It does the job that I bought it for perfectly. Now I have digital audio on my system from the ps4 slim, which doesn't have an optical output. Everything is good