Stainless Steel 70dB Alarm Security Lock with 3-Key (3 x AG3)

Pros: First of all - it works, and looks sturdy. The arc of the shackle bar is wide enough to use in many places: hasp, chain, disc brake etc. Arming and disarming is delayed - you have few seconds to open it and disarm before the alarm goes on. The battery is replaceable: the padlock can be disassembled by unscrewing two screws through the bar holes. The alarm is louder than you expect from a tiny device like this.

Cons: The alarm sound can be blocked almost perfectly by pressing your palm to the holes on the bottom...
Only the bar made of stainless steel, the padlock body is some kind of aluminium alloy - it weights only 170 grams without the shackle bar. (260g total, not 435g as described) I bet it can be easily crushed by a medium hammer. Powered by 6 button cells. The lock mechanism seems easily picklockable.

Other: Looks serious, and works as it should, but the quality is far from perfect. It can surprise an amateur thief, but will not protect your valuables from a prepared one.

Pros: Works pretty well, looks very tough and the key is very unique. The alarm sound is not that loud, but enough to draw some attention. It warns you when the battery is low

Cons: I dont see any cons in it. does what it is mean to do and nothing more. The only detail that you should be aware is that it is bulky and you will need some big pocket to put it in while you are driving.

Other: would be nice to have some other colors.... :)

Pros: lightweight and easy to use alarmed padlock. just rotate the shackle to activate/deactivate the alarm. I use it for my bike. Getting new keys may be difficult since I've never seen these in stock in my local locksmith shops. The padlock comes with three keys so it should be difficult to loose all the three keys. Just leave two at home.

Cons: doesn't look bolt cutter resistant, but the siren should prevent theft anyway.

Other: good for the price

Pros: Great security lock which really prevents thefts and other broking crimes because of the lock is nearly impossible to open or get broken. Very easy to use: lock by key to alarming state and Your bike, motor cyckle or even home door is safe because if somebody try to go through the lock sirens begin to alarm loadly. This make almoust impossible to open lock without keys. Also the keys are very special.

Cons: Difficult to find.

Other: Great alarm and security product