Attention, it is not wireless, which means that when it rains or you want to charge it, you can't take it out since you have to uninstall it. Nevertheless, its sound is very good, at medium volume I can hear it loud. The microphone is decent, they can hear me quite well.

I bought this as my first device for the helmet, without having crazy expectations. At first, the headphones did not fit well with the adhesive tapes inside the slots, resulting in them coming off every time I took off the helmet, something that can be solved with a stronger double-sided tape of course. On the other hand, after about 6 months the USB port broke and now it doesn't charge, so it's useless. Therefore, I will also say that if you want something durable, you need to spend more money, even though the sound inside the helmet (at speeds of 150+-) was very decent, while the microphone at low speed in the city was okay.

New update: it turned out that the product I bought was defective and I bought the same one again.
For its price and for someone who doesn't have many requirements, it's just fine!

Perfect product! Absolutely no problem! You hear perfectly, they hear you perfectly! I connect the phone, put on the radio or music and the ride becomes very pleasant! The battery lasts for many hours. The sound is not JBL but for a helmet that's what you want, it doesn't have so much bass but for 18 euros it's super value for money! I bought two and there is no problem with either of them! If only it showed the battery level somehow...
upd
1.5 years of use and it still works just fine, I bought another one and gave this one to a friend who also has no problem! I bought it for 18 euros and it can't be compared... The only difficulty is that you have to charge it together with the helmet...

The microphone is so-so, the speakers play very low if you go over 50 km you can't hear anything

Excellent for its price!

Very easy installation (provided that there are slots for the headphones in the helmet! This applies to all helmet intercoms!), connects directly to the mobile phone and the connection is stable without interruptions! Satisfactory headphone volume (music - conversation)

Easily competes with more expensive intercoms!

Get it without hesitation!

With a little cutting and sewing, it's awesome, of course it requires some work to put it on, if it didn't, it wouldn't cost 16 euros because everyone would have to get their own helmet

For the price, it is very good, connects immediately to the mobile phone and installation is very easy. My helmet had a slot for the headphones so it doesn't press on my ears at all. Now as for the sound, it is average, in calls over 90 kilometers I could hardly hear at all. For GPS use it is perfectly satisfactory, and with the price it has, you don't worry if it will break.
UPDATE
Unfortunately, after 2 months of use, the charging plug broke, so it's completely useless.

It's fine... I can hear and be heard...
Now if you want something more, there are other options that are more expensive...
For 19€, it's value for money...

Three months of constant rain, cold, humidity, and hours of use, and it hasn't suffered any damage. Yes, it doesn't have the super wow sound, but for its price, it's a bargain.

Guys, it is good to judge in relation to the money we give. And for its price, it is perfect. With a good double-sided tape, you have no issue

I have it for 5-6 months and it does its job just fine

I understand that for its price, it wouldn't be the best product on the market, but one would expect it not to be problematic. As soon as I tried to apply it to the helmet, the straps came off immediately, and the tape for the external control didn't even have glue on it, so I had to put it on myself. It doesn't fit properly, not even on its own piece, let alone on the curve of the helmet. It's better to spend the extra money on a system that is made for your helmet and not waste money on supposedly universal products that don't work everywhere. These are my thoughts on the build quality, and it hasn't even charged yet for me to test the sound or the microphone.

I consider it unbeatable at 17.99€.

It doesn't have the sound that a device of 60€ has, in terms of quality and bass.
However, the volume and overall sound are very satisfactory.
It connects literally in a second and the battery lasts for me, who use it quite a lot, about 6 days.

Time will tell how long it will last.

VFM!!! If it wasn't for the previous reviews, I probably wouldn't have bought them... but for this price, you can't go wrong... I bought 2 at once for my wife

It is very good, very powerful sound. Just every time you use GPS or make a call, the first two to three words get cut off.

Very good for its price, the speakers are quite powerful, you can speak comfortably and when you have speed. I recommend it.

They have a little issue with the application inside the helmet. Other than that, they are worth their money and more. Very easy connection with the mobile.