You haven't translated
http://www.yatego.com/spezialhandys/...haus-auto-boot
have you?
checks for movements, external sensor possible, own battery, you can check bat-level and change levels of trigger and can listen in, what is going on.
Greetings flying Bull
For uk a little bit different i.e.
http://www.mobilarm.co.uk/prod.html
or look here
http://www.gsm-alarm.de/cms/index.php?id=5
or use google ;-)