Doesn't work on OSX.5.6 ! Even with all sensors enabled as triggers nothing makes the siren go off. Shaking the MBP, or tapping the keyboard, or the trackpad, or whatever. Nothing!

I'm going back to iAlertU. Been using it for 2 years now. Works like a charm. Excellent if you need to step out to get a cup of coffee, or to go to the bathroom, etc.
Whenever I am in a new place I demo the siren before I step out for the first time so that everybody within 60 to a 100 feet clearly gets the message. And it works, putting the fear of God in anyone around, because my MBPs have NEVER been stolen, nor has the siren even been 'accidentally' set off.

Get iAlertU here: http://www.versiontracker.com/dyn/moreinfo/macosx/10577703