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 Thoughts: I have acquired another one with codes rather than small key that is much better quality.. abit more expensive but WORKS..............

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

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 Thoughts: what can I say more for a 3$ worth product.

Bottomline: 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: -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 Thoughts: I had this out on the rain just once and the machine stopped working on me. It would be useful if it was waterproof as the weather is unpredictable and you can get caught in a heavy rainfall.

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

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 Thoughts: .
* I have not tried to let it sound the alarm till it stops (the sound is
quite painful), so i don't know how long it lasts (claimed 35 secs).
* I don't know if it will be broken by rain/water. Probably it will work if
you let it dry.
* Where the bracket is mounted to the alarm there is two extra screw holes
in the mounting bracket. I recommend finding two screws that fit here to
stop the alarm from spinning around the big screw.
* I mounted it to the luggage carrier of my bicycle by bending the mounting
bracket around a bar. It was the only place on my bike with a thin enough
bar.

Bottomline: .
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.