On my 07, there are two security devices listed. One is an ignition cutout switch - and is supposed to use an RFID in the key to know that the car is ok to be started - that device flashes the word theft on the dash. The other bit is the perimiter alarm which I think is simply a basic alarm that is probably rigged off the interior lights.

The whole system seems very basic. On my last car I installed an aftermarket Crimeguard 745i alarm that I got at Crutchfield - it came with all kinds of features such as breaking glass sound sensors, vibration sensors and interior and exterior radar and lots of accessories such as remote start and the ability to close up the windows from the remote. I would not pay more that about $50 for the stock Ford system.

2007 Ford Escape Hybrid FWD
Premium Package
Safety Package
Moonroof