ive got a micro scan system fitted on my car with

Dual Zone Microwave (for internal & external protection)

it uses a radar scanner to sweep the inside outside of the car
at the moment got it set to 1 foot radius around the car
enter this area Peizo Beeper under bonnet starts to sound off
just bleeps on my setting cos car parked in culdesac and
loads of kids and dogs in street
but you can change this to 3 bleeps alarm sounds
its a quality system and can be modded to loads of upgrades
mines full closure system with pager that works upto 1km range
its not a hard thing to fit i used to work with car alarms and me
and a mate from lazerline fitted it years ago to my first s2rsturbo
as a test case ps it also uses rolling codes


have a look at there site i have swopped this to 4 cars over the years

NEVER HAD ONE STOLEN OR EVEN BROKE INTO

http://www.microscan-car-alarms.co.uk/start.htm