I have it on my TCH. It's just a basic noise maker to scare away kids if they mess with it. The engine immobilizer is going to prevent everyone except the most determined theft. The alarm is basically going to discourage kids from messing around and causing too much damage thinking they can start it or steal something out of it.

Two climate control systems, one inside and the other at the tailpipe.

2007 Camry Hybrid (in service June 2006)
FE: 6.67L/100km or 35.3 mpg (6.11L/100km or 38.5 mpg in summer)