The alarm is hard to activate; several times before I manage to attach the key properly, I shake it like a milkshake and it doesn't make a peep.

I would rate it 5 stars but what I don't like is the activation function. You have to make sure, until you find the hole in the disc brake where it will go, that it hasn't gone down to a certain point, otherwise it works like a padlock. Also, the lack of instructions in the packaging is also a negative. Other than that, it seems very reliable

The speaker is not protected; it is on the side with the thin part and it is plastic on the outside. If you hit it with a hammer and screwdriver, the speaker will definitely get punctured. Overall, it does not inspire confidence in its construction.
As for the sensitivity, sometimes it goes off at the slightest thing and sometimes not at all. I should have spent a little more money and bought a better one.

Very good lock. Strong and smart alarm. It rings for ten seconds if there is no violation. It doesn't annoy you with unnecessary rings. Small and light lock, which can be locked even without the key. One small flaw (for me, hence the minus one star). To charge the battery, you have to easily disassemble the mechanism, but a slot could have been made on the top outside

Impeccable and sturdy, the only bad thing is that many times I want the 1 beep but it confuses me and 2 beeps sound (without alarm)

It probably has very low sensitivity.. it doesn't go off easily... the device needs quite a bit of shaking to activate..

I have had it for a month now and I have to say that it is amazing, worth its money. It has a powerful alarm. To understand how it works, some users explain it below or otherwise you can find videos on YouTube

It seems to do its job, I hope I never need it. In the roughly one month I've had it, it has gone off 2 or 3 times without reason, resulting in, the first time, me running out half-naked to see who was shaving the machine. In the end, as it turned out, it just wanted to go off. Two days later, it went off again on its own, as I was moving away from the motorcycle. Maybe it's a bit difficult at first to find the hole in the brake disc, but you get used to it easily. Finally, very important, for the alarm to arm, it must make 1 beep as you push in the pin. If it makes 2, it doesn't arm.

Very nice disc brake lock, not overly sensitive and with a powerful speaker! I would call it a value for money purchase!

It has a very loud siren and good sensitivity, and it also seems to be durable. Besides, the brand inspires confidence. The reason I deduct one star is the lack of any user instructions, both from the packaging, the website, and the company's YouTube channel. I had to look for third-party videos on YT to fully understand how it works. In short, it can operate both with an alarm and without, as a simple disc brake lock. If you lock it all the way (no need for the key, just press the pin), you hear a "beep" and after a few seconds you hear an even longer "beep." This means the alarm is armed. But if you press the lock halfway, hear the "beep," and then lock it, you hear two "beeps," which means it is operating without the alarm.
And a visual aid:
https://www.youtube.com/watch?v=31jyID4aaJk

2 in 1. Very good and you don't need an alarm since this does both. Very practical, you charge it with USB every so often after removing the mechanism from the lock. By pressing the lock button to lock the padlock, just before it locks, you hear a single or double "beep". The single means the alarm is armed and the double means you lock it without arming the alarm. So you can choose whether to lock with the alarm or not. It is not very sensitive; even when I have it armed, I put on the cover and it doesn't go off.

Quite good, the sound is strong, note that it also includes an Allen key inside to open the battery in case it needs replacement or charging. It also comes with a strap so it won't be forgotten on the disc brake

It fits perfectly on the NMAX!!
The alarm confuses me a bit about when it activates.... other than that, everything is fine!!

sometimes the alarm is sensitive while other times no matter how much you shake it, it does not activate

It's not very sensitive, which I find positive. Its siren is quite loud. The only thing I didn't like is that when you "arm" the alarm, after 5 seconds it makes a very loud "beep" that is ear-piercing. Not good at all when this happens, for example, in the summer at midnight!

I can't describe how satisfied I am. It is really powerful when activated. Don't listen to nonsense that it goes off by itself, that the alarm starts from the wind, etc. IT'S NOT TRUE. However, when you try to mess with it, to shake it roughly, then it starts to go off. The battery lasts for months. You charge it with USB very easily.

This specific product is very worth it.
It is powerful in sound.
Waterproof, rechargeable, and relatively sturdy construction