For some basic model like LE, XLE, it doesn't come with an alarm system (unless you upgrade with an option for thousand more). What kind of aftermarket alarm system choice are there? I did some research and found that in UK, there is a product called Cobra 4615 which includes ultrasound to detect intrusion. It has the feature to detect a hand through an open windows. Also, it uses CAN BUS which minimize the cutting of wire. What option do we have in USA?