If you want or need to protect your motorcycle from theft, you can of course install an expensive alarm with tracking capability, flashing lights and dancing girls. Or you can get one of those demobilizers which include sirens, but are quite bulky to carry.
Or as a simple and cheap alternative, you can get the Puig Simple Bike Alarm . Puig , a Spanish company close to Barcelona, makes an alarm that totally conforms to its product name "Simple Bike Alarm". The motorcycle alarm is small, portable and installing it is a matter of a second or two.
You can see from the photo on the left that it is indeed small. It has as base a magnet (it also has an adhesive pad), so you just clip it wherever you want. Obviously, no matter how strong the magnet, you'll not want to ride with it, so you'll need to put it where you can get to it to unclip before riding away into the sunset.
Once you've arrived, lock you motorcycle, and place the clip wherever you want. You arm it by pulling the clip. Now, whenever the motorcycle moves, an alarm will sound. The 6V alarm is self powered so need to wire it to your bike.
The upside of this is that it's very portable and can be put almost anywhere, not just motorcycles. The downside is that a thief can remove it easy enough. But it does mean he/she will be doing that while the alarm is blaring, not an easy task.
But the biggest advantage is the price. Around €25.
Click here to access the Puig Simple Bike Alarm page