Car Guard is powerful, easy to setup, low cost solution, you need mobile phone support GPS and Java MIDP 2.0 support.
You'll install the software on the mobile and whenever you leave your car you hide the mobile into your car you can change the place each time which make it harder to anyone to guess or predict it.
Easy setup: you don't need to connect anything,No wiring required
If your car moved away form where you left you get instant alarm message on your mobile phone with its location and distance, and message every interval with your car location you can easily track you car.
for more information visit http://smamob.com/cg/
for help and usage guide visit http://smamob.com/cg/tech.htm