The intellistart was £150 on top of the price of the alarm. The whole system cost me £350. Mine is parked on a road at night, and I also work nights at various locations, so an alarm is invaluable. £150 may seem quite a bit for a "gadget", but belive me, it's been worth every penny these last couple of days. Remember, you can also set it to turn the a/c on in hot weather. (however you leave the car- a/c on, heater on, rear window heater on, that's what will still be turned on with the starter). Sounds like an advert, but no, I don't work for 'em!!!