Crystal Vision Anti-Theft Loud 130db Alarm Lock Weather Proof Heavy Duty Multi Purpose (10mm)

We have had issues with people trying to get into our shed with a combo lock on it. Fortunately they haven't been successful. We decided to upgrade to this lock so that we could prevent them from trying to hack the combo. We bought the larger size and it just barely fits through the hole since it is large. The lock is heavy, feels sturdy and is fairly easy to use once you understand how it works. One beep for armed, and two quiet beeps for disarmed. I lock it and then just barely turn the key to hear the single beep, followed by a loud chirp. The battery is easily replaceable and is located inside the lock only accessibly when the lock is open. The product is shipped with a battery so you can see how to insert/replace. Definitely recommend this lock. It would also be great for motorcycles/bikes etc.

It is very loud and the battery last for a long time

Just bought this lock and installed it in my storage unit after vandals attempted to open my other lock which they had a hard time. The reason I went with this lock is because it looks durable and because I have it on my outdoor storage unit it will be so loud that it will scare them off. Alarm will go off with a simple tug and the security key is also a plus to this lock. Only issue I had was figuring out how to install the battery which I quickly figured out.

Very sturdy lock with an alarm system that is just OK. First of all, this is a very big and heavy lock as other reviews noted - so no points off because that was clear before I ordered it. The alarm setting procedure seems odd - I'll carry the instructions in my bike bag because it's definitely not intuitive and I may not recall it six months from now if I don't use it that often. Putting the battery in was very annoying as the screw doesn't come out as one would expect and loading in the battery itself is difficult. The sound was not as loud as I expected. I'll keep the lock as it's marginally adequate for my needs, but wouldn't recommend it to anyone else.

The instructions for activating the lock are TERRIBLE. After experimentation I have found that what works every time: SLIDE THE SHACKLE INTO THE HOLE TO LOCK THE DEVICE. Then, as you HOLD THE SHACKLE SO THAT IT WON'T POP BACK OUT OF THE LOCK, insert the key and turn it all the way to the right. The lock will try to pop open but WON'T AS YOU ARE RESTRAINING IT, turn the key carefully back to center position (it will make a slight beep sound) continue to turn the key all the way to the left and release the assembly. After a couple of seconds, the lock will make a loud beep, meaning it is ACTIVATED. I am very satisfied with the lock so far. If it is moved it makes 5 LOUD BEEPS in succession and GOES OFF with a LOUD alarm.

Wow this is a great product , I initially thought lock would sound only when some one tried to tamper. Even vibration on the latch or chain will cause an alarm. And the noise is very high. Will scare the hell out of any one trying to pick the lock. I use it to lock AC power box. So that no one can turn power off and cut AC wire and steal them without sounding a loud alarm.Perfect to lock back yard stuffs , garage anything. This is a must own product for everyone.

So it feels heavy and sturdy. It's a little bigger than I thought, but works fine for my application. One issue right away is that the instructions are incorrect about how to arm/disarm. They say to turn the key anti/counter-clockwise, but you in fact turn the key clockwise. This is the same direction you turn it to lock/unlock the shackle. So you can end up in a situation where the shackle is open and the alarm is armed, or you can lock the shackle and not have the alarm armed. You also *need* to use the key to arm the alarm; I would have preferred the alarm to arm automatically when you close the shackle, so you can just close the lock and walk away, having it armed. Instead you have to close the shackle, then insert and turn the key to arm (and not turning the key so far as to open the shackle). The siren is pretty loud, but it's also quite easy to just cover it with your hand and make it MUCH less loud. I'm sure it's a "good enough" deterrent, but someone could pretty easily work on the lock while muting the alarm (or even spraying something into the speaker to disable it). If it holds up to weather for a couple years, I think I'll be satisfied and will upgrade to 5 stars. Definitely NOT an unpickable/unbreakable type lock, but a more than adequate deterrent, especially for locking something in a relatively public place. Personally I wouldn't lock an expensive bike with this unless I'm going to be near it (coffee shop or something) or if it's in a small town or something. For NYC or an expensive bike, get a heavy duty lock and chain and also a cheap alarm.

Well guys I think we may have a cheaper alternative to the standard motorcycle lock, it fits my Honda Grom and CBR disk brake quite well the only thing is that once it's triggered it's set off, no warning but because of it's loud 130db (which it really has!) It's worth working with. Currently I'm not aware of a bike lock with an alarm with 130db, at best there around 120db and the really good high quality type will run you abouts $55 to $150. Some would cost about $50 for 110db! Oh and this company makes a "U" lock with the same features for the same price! (That my change soon.) They come with a cr2 battery, which is much better for performance than button style batteries.

Excellent... Sonorité très puissante...

Could be cheaper

C’est vraiment un bon système d’alarme très efficace

DO NOT PURCHASE!!!! Worst product ive ever bought! The alarms is great, the lock is not. Such a piece of garbage.. surprised these even made it past quality control - I guess they are not tested for rain or snow? I ended up putting on a lock from 20 years ago that actually works.