check this out guys... the one with the pager sounds good...

http://www.credexltd.co.uk/

http://www.world-data-systems.com/rb5/smallrb5side.jpg

I like the sound of this although I have one concern, along with the blackjax. They both trigger when the car is either stationary or when travelling slow enough to be stopped safely - as in the blackjax. Very few thieves are going to be travelling at anything less than fast meaning that these devices probably wont get triggered until they're at their destination anyway. Once at their destination they are free to do whatever they want with it, disarm it, strip it etc. etc.

Obviously there are safety issues with enabling both to trigger whilst on the move.

The RPM sense feature of Blackjax is configurable. If you don't want it to be RPM dependent, it doesn't have to be...