After 3 years, I decided to share my opinion as well.

I will start with those who mention the plug. A common mistake is that they connect it too low on the helmet (at the level of the neck) resulting in the helmet touching something and the headphone cable getting connected.

The sound is great. The helmet itself plays a big role in sound isolation, so if you want to avoid hearing the wind, the solution is in the helmet and not in the headphones.

The microphone is excellent. Whenever I have spoken on the phone while driving, no one realizes that I am driving due to the noise cancellation. Heads up, when talking on the phone, close the air button on the chin of the helmet.

In terms of connection between two, it's okay.

The only issue with mine is that when it is connected and nothing is playing, it may make a call to the most recent contact.

With an extra 20-30€, there are definitely many more worthy options, but for its price, it's a treat!

3 months in my possession and it works perfectly. Powerful music, long battery life, doesn't lose connection with the phone, and the microphone isolates EVERY external noise. You have to have it very close to your mouth, but it's logical in order for the listener to have perfect sound. I don't know why everyone is talking about the plug, the plug is type-C and hasn't been damaged at all. I went to buy a second one for a passenger.

Well.... I actually ordered it from another store and it came with a different type of USB mini plug. So be careful when you go to someone to see what plug it has, as each one has a different stock. The communication between them is very good and clear. Up to 100 that we tested with air, they were fine. They connected easily and each time they simply start communicating with a press. Zero sound delay from one to the other as well!

It's worth its money!!!

Waste of money!
They lasted for 1 month and neither charging port worked on both devices.
Most of the time, you had to go through the pairing process multiple times to connect with the passenger's device, and even when it did, you could only hear them at very low speeds (40-60 km/h).
I would never recommend it to anyone, as I see that there are much better options available for almost the same price!

The charging plug is terrible and broke very quickly.
The sound with the passenger is not good even with a few kilometers.
It constantly loses connection either with the passenger or with the mobile.
Overall, it's a waste of money...

The cable is terrible, relatively soon (3rd to 4th charge) it started to have poor contact, so it could only be heard from one side. By shaking it, it would work again, but it really annoyed me when I was on the move... until the plug socket broke and I replaced it with the second one I had in my wife's helmet, which she didn't use... exactly the same problems with the second device. The next one I will buy, I prefer to pay for it once and for it to be worth it, since the hundred and something euros went down the drain... It would also be good if it was compatible with other devices, as not everyone in a group has the same brand of communication devices.

I have two units. They have been in my possession for 3 years, purchased from abroad, and they work flawlessly. The communication with the passenger sounds clear up to 130 km, after which it is lost. It does have its own charging plug, but I cannot lower the score since it costs 50 euros, while a Sena does the same for 200 euros

It lasted for 1 month... The charging plug broke... And I was being careful... I can't believe I wasn't careful enough... It's better to avoid using such a plug for communication..

Quite good, it does everything expected. In the negatives, the charger, cable, and plugs are of low quality and easily break. Particularly negative is the charging plug, which is their own patent and not sold separately. Some issues with initial communication between two devices. Sometimes, during activation, they do not pair with each other and a reset is required.