Saw one where they fitted the alarm itself under the dashboard somewhere ...120db inside the car is bloody annoying...if you get a dual oscilating siren it can cause issues in the ears resulting in dizzyness and nausea.....
he also had a strobe light in the dash in font of the driver that would point towards the windscreen....A - it was visible for bloody miles...if you could see the car- you could see the flash....and B- the reflection off the inside of the windscreen towards the driver was enough that all you could see was green blobs for an hour or so......especially at night- no way you could drive it....
It was an older car and to be brutal, it was not one that was likely to be broken into even wthout the aarm (it loooked like a rusty piece of crap..) but he wanted to see if it would work as an alarm / deterent.....
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