if you've got an existing alarm stick a volt free relay on the existing sounder output instal a banshee siren .
If it dosent stop'em ( if your close enough long enough some can make your ears bleed ) at least everyone in a half mile radius will know about it
 
Hi - I have been looking for the GSM alarm you mention but cannot find it - can you help? thanks

Scott
 
Hi, It's really nice to read your all comments here about the car security because I am also looking for such project for making secure my own van. I already have lost one. so I must say thanks for sharing all these information.

Victor, I agree with you. I have gone through all the posts in this forum and learnt a lot about van security and the precautions to be taken to keep my van safe.
 
i find these work very well
Crotalus_cerastes_mesquite_springs_CA.JPG

seriously though a van vault and motion sensor with a very loud siren works pretty good
 

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van security, which is best
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