Vibration Activated 120dB Bicycle Anti-Theft Security Alarm

Pros: Well i received some ones and i can say It can has a loud alarm noise. It has a low timer (not 35 seconds, it lasts from 9 to 14 seconds).
External build is not bad.
You can have an alarm for a low amount of bucks.
It's really really cheap.
The shock/motion/vibration sensor works ok.

Cons: The key is really bad. The key lock is already another bad-made part, in fact the thing that makes bad this alarm is the lock.
All the rest is in line with the price you pay.
Some of the ones i received the sound doesn't work properly.
Another i had to solder again some parts.
Some sensors work better than another ones, but in general they are ok.

Other: If you are lucky or you buy more than one, you can have a really cheap alarm to mound where you need.
A friend is thinking of installing one on a motorbike, another wants one to make jokes and for his bicycle.
Resuming, for the price it's a good alarm!!

Pros: Does not activate if someone brushes past.
as cheap as it is, its built OK for the price.
VERY loud, the alarm sound is good and effective. I haven't let it sound for its full 35 seconds as it would attract too much attention (what its built for!!)

Cons: The bracket is too small to fit onto a bike!! it needs to be longer to fit round standard tubing. I suppose a bit of gaffer tape would keep it on but that isn't a great option, especially if it starts to rain as it isn't water/splash proof.
The key is very small and could easily break.

Other: cheap, good alarm, not easily activated if you just brush past it, but could do with making some more additions as stated above. See my video of it here:
http://www.youtube.com/watch?v=QzmyKrSJE-0

Pros: I taped this to the underside of my pannier rack, and zip-tied the key to one of the rack legs. If I don't feel like locking my bike, or if I'm in a very insecure neighbourhood, or if I am leaving my panniers on my bike, I turn on the alarm.
When you shake the bike enough, the alarm goes off. It chimes for a while, then stops (unless you continue shaking). But it's not so sensitive that you can't (carefully) pick up the bike and move it, if you know the alarm is armed.

Cons: I never take the key out: it's too flimsy to handle too much. The "lock barrel"/switch itself isn't much better. It's all hidden in an unexpected place on my bike, though, so I don't worry about someone being able to figure out what's going on and turning the key.
It's pretty high-pitch, so while it's also very loud, you might not hear it if you're inside.

Other: I'm getting another one. You could probably also use something like this for pranks.

Pros: A really loud vibration activated alarm you can use on your bike, motorcycle
or anything. Turn key to green and its armed. If you (or a thief) bump it or
what its mounted to it will sound a loud alarm until you turn the key to red
to disarm it. It reacts to small vibrations, not movement/acceleration. So
if you move it really smooth it wont go off. To turn it off without the key
you would have to smash it or demount it and then unscrew battery
compartment (the one screw on the back both closes battery compartment and
mounts the bracket to the alarm).

Cons: .
- Battery not included, battery costs more than the alarm where i live
- Only one key included (if you loose the one key the alarm is useless)
- Cheap build quality
- Flimsy key
- Mounting bracket is very small
- Battery compartment is slightly too small

Other: .
A cheap and actually very useful alarm. I use it when i ride my bike to the
shop and park it outside while I'm inside. Much quicker than locking it. It
seems to survive quite bumpy rides. Although it broke once. But i opened it
and could see what had happened. The one connector from the lock didn't have
contact with the circuit board anymore. I soldered it back in place and now
it works again!
So the bottomline is: Although it has poor build quality, it works as
intended, has many uses, is quite useful, is cheap and is not hard to repair
if you have a soldering iron.

Pros: -Cheap
-Alerts when the bike is shaken
-Sensitive
-loud
-Key to turn off Alarm

Cons: -No instructions
-Poor build quality
-Not water proof!
-Flimsy Key
-Hard to mount on a normal mountain bike
-Poor packaging

Other: Don't leave it under the rain! As it's not waterproof. But what can you expect from the price?

Pros: -Very loud, five seconds is enough to make you turn it off. -Very sensitive (see cons)

Cons: -Too big, I cannot mount it on my bike in way to be discreet. -Too loud -Dx should include the battery -no instructions -poor packaging -I reaaaaly don`t know where to mount this thing -cheap plastics -there is no reason why it couldn`t be smaller

Other: It is a preety nice antitheft device, it should keep the thieves away from your motorbike/bicycle but I will still lock my bike as used to.

Pros: After some complains about delivery of the product I finnaly got 2 of those alarms. Both came with problems and did not work. I was tired of complaining about delivery so did not complain about geting a useless and broken product.

Cons: The building quality is terrible and the material used is really bad. One of the alarms arrived with stuff inside broken and disconnected...........

Other: I do not reccomend this product. Very cheap for the proposed idea but at least with me did not work..........

Pros: - VERY loud (multiply that by 100 times). This is good.
- Thief cannot disarm the alarm without the key
- Smart circuitry inside prevents shrill alarm from wailing continuously the whole day when activated, thereby helping you to save battery life.
- Compact shape fits nicely in the palm of an adult's hand. Can be mounted anywhere, not just on bicycle.
- Can be used to guard your laptop or notebook while you step away for a moment. You can see a demonstration of how this can be done in my youtube video review which will be posted shortly following this written review.
- Simple design without complicated electronics inside means that it has less chance of breaking down. As long as the solder joints inside are well soldered, this alarm should be able to last you a long time.

Cons: - None in my case.

Other: I liked it so much I bought a few more just in case it gets sold out!

Pros: I bought this bicycle alarm as a replacement to another I had which was activated by three buttons (ABC). The previous alarm consumed the battery very fast, even when it wasn't at standby. This one has a key, so it is totally switched off when not needed. Another good characteristic of this alarm is that it has a metal bracket that can be bent to fit most bicycle bodies. It's also small enough not to bother by it's size or appearance and I like its design.

Cons: I was very disappointed by the siren. It's unbelievable weak. Its noise isn't noticeable from a near distance. Also, there are no screws included. No way to screw the metal bracket to the plastic cover. The plastics are cheap and fragile. A thief could easily make it silence with a good hit of a hammer. The keys are very fragile too. There is no delay from the time to insert the key to the slot to the time the alarm rings. That's annoying. It's certainly NOT waterproof. The electronic board inside should be put in plastic or rubber cover in order not to be ruined by water. Finally, there is no manual at all.

Other: If you like cheap electronics like I do, this alarm fits your needs. It's very simple and less consuming. It can (with modifications) be placed anywhere. If placed on a bicycle, you will be notified when someone tries to steal it, as long as you are near enough to hear its weak siren. Try not to leave it in direct sunlight in the summer, nor under rain. Its plastics are very poor and it's not waterproof. At least, it doesn't consume battery neither at standby, nor at off mode, like other alarms do.

Pros: Very loud, and good, usable, locking system.
Also very sensitive, so don't touch your bike when it's activated.
This has actually a nice effect, I have it on my bike and someone tried to steal my bike the other day. The alarm went off and he ran away! So, when you have this/buy this, you can go without worrying about someone stealing your bike.

Cons: Did not fit well the first time, and is not waterproof. Needs some 'Do It Yourself', and make sure the 9V block doesn't hit the metal thing. It shortcuts when you do, stick a piece of paper in it, and you should be OK.
Also, it looks larger on the pictures.

Other: This is a must have for many people. If you also have a normal wheel lock, attach the keys to it as well with a cord. It's so much easier then.