Economical and reliable for its price, plus the fact that the alarm is sensitive, which is good.

Very good lock for its price, with an alarm that sounds quite loud!!! Its battery lasts for a very long time. It somewhat deters amateur thieves!!!

Just fine, even if the batteries run out it still does its job. For this price, it's just right

The worst thing I have ever bought, I forgot the keys and broke it by hitting it twice with pliers. The first time the alarm stopped, and the second time it broke

I got it for her alarm as a second lock.
So:
POSITIVES:
works well
is easy to use.
is a good size.
is lightweight
comes with batteries
you can also use it elsewhere as an alarm, e.g. on a bag.
NEGATIVES: the quality of the metal is not reliable but as an alarm it works

After about a year of use on a moped that I always left under a shelter, I left it once outdoors where it rained and the sound broke... now I just use it as a simple disc brake lock

Very good for its price. I've had it for 2 years and the other day it proved its worth. Someone tried to steal my bike, but in the end they didn't succeed. It deterred them, but now it is no longer functional. For me, it's worth it.

Quite sensitive, it goes off at the slightest thing. I live on the 2nd floor and I can hear it. Very good for its price. It has been through about 5-6 rainstorms and nothing has happened to it. I recommend it.

It broke down in 1.5 years. The alarm would go off even in the rain to the point where I had to deactivate it. To open it and remove the batteries, I had to buy a special key that is only for this lock. Money wasted twice.

Good light cheap, not for anything serious security for some amateur to prevent..good for the money

I bought it almost 3 years ago and it still works perfectly. A good choice and for its price very good

After a year it stopped working properly, I changed the battery but it doesn't make a sound after locking. Very sensitive to rain. For the money, it's okay

Very powerful alarm and it has a huge battery life. Almost a year and I haven't changed it yet.

The lock is extremely sensitive. It triggers even with a slight breeze.
I would suggest you get something different!

For the money it costs, it's just fine. The alarm annoys me at the slightest thing, meaning if you don't unlock it immediately, an annoying siren starts for about ten seconds. Other than that, it's just fine.

In an enclosed space when I tried it, it sounded quite loud. When I put it on the bike, if you don’t live on the first floor with an open balcony door, don’t expect to hear it. Also, it is indeed very sensitive. The wind brushed against it and it started to go off. Also, as a lock, it seems cheap. Maybe as a second alarm it does something. I wouldn’t recommend it. Of course, with 7 and 10 euros, we can't have high expectations.

I have had it for about 1.5 years and it hasn't had any issues. If you have applied the lock and, for example, move the steering wheel, the alarm goes off but after a while it stops.

Very good for the price it has. Don't expect it to be something heavy or durable. I think its usefulness is the alarm.... Maybe the battery won't last long due to the sensitivity of the alarm.

It works fine, I have dropped it twice and it hasn't broken. Its siren is louder than the alarm.

As a first indication, I am satisfied. The product came with a built-in battery. In the test I did, I saw (if I understood correctly) that it first emits a warning sound for a few seconds. Then, if you continue to shake the machine, the alarm goes off and when you stop moving it, it beeps a little more. It stops about 3-4" after you leave the machine still. We will see in practice. For 13€ I believe it is worth it even without the alarm.

As a price, it is good but because I had it in the trunk, the screws came loose from the lid and got lost, and now it is naked without a lid.....unacceptable for 1 month of use....prefer a more expensive one

It works satisfactorily.
Moderate sensitivity. There have been times when I removed the hood from the camera and it didn't trigger, but it is common for it to trigger during removal.
It cannot be compared to the sensitivity of an alarm, but for its price, it is sufficient.
4/5 stars because the volume is close to 95db and not the 100+ that it claims.
It is fine for short stops. But not for leaving it in the airport parking lot and being carefree.

The best thing is that it is cheap and has a powerful alarm. The only negative is that it is heavy and when it rains, it wakes up the whole neighborhood. I don't know how to rate it, it is perfect for normal days but when it rains, you have to take it off

For its price, it is just what it should be. The only drawback is that it is relatively sensitive and easily gets hit by vibrations (e.g. until I disarm it, it will definitely get hit at least a little)... but overall, it is worth it.

Perfect for its price. The quality is also proportional, of course. But they are not better than those that cost 30 euros more. They are of equivalent quality. Highly recommended.

Very satisfied with what I received. Quite sturdy metal construction, it takes batteries inside and you have to unscrew 4 screws to violate it, which is impossible without hitting it. As soon as it receives the first vibration, it makes a warning sound and on the next one it starts hitting for a few seconds. Its sound is quite loud and piercing. If it holds up over time and doesn't start malfunctioning, it will be excellent. The only thing I don't trust much is its waterproofing, but time will tell..!

It goes off on its own with three beeps (notification before the alarm) without being moved by anything. This happens quite often, maybe every 5 minutes.
Also, it is not a sturdy construction. It can be easily broken into.
The alarm sounds relatively loud for its size. But it doesn't catch attention.
It has been functioning for 1 year and something, which is positive.

Extremely annoying alarm with a good volume for its size. If it is below your house, you will definitely hear it unless you live on a high floor. It is quite sensitive but not excessively. Mine has been through a couple of rain showers and nothing happened to it. It is not completely secure, but I don't go out every now and then to check if the machine is there.

If someone tries to break it, they can easily do it. The only positive thing is that it has a strong sound, so for its price, it's okay

Cheap and powerful in sound to alert you if you are close or to scare off any random thief who messes with your machine. Not the one who really wants it because don't expect it to withstand an attempted violation since it can't even handle the force of a disc brake.
I forgot it with a dead battery, started it up, and it broke like paper without even bending the disc. That's the very positive part...
Just see it as a vibration alarm and don't expect anything else.