That one for $99 at JC Whitney has the microwave sensor as well. Those are a bitch to adjust but once you get it right they're nice to have, especially if you have a covertible or a jeep. I can't tell if it's a single or dual zone sensor though. What's nice about a dual zone is you can set the warn away zone, which only chirps the alarm, to be just outside the car by an inch or so. So If someone gets within an inch of the car, it'll chirp at them. Then the second zone is set just inside the car so if your window is rolled down, or a convertible top is down, it will go off, full alarm if someone reaches in. I take back what I said ealier Zex about the ignition controlled thing. I thought that was just for the lock/unlock, but that's for arm/disarm as well as lock/unlock. I don't like automatic arm/disarm with the ignition. That's typically called "Passive Arming" and when it's on, it's on and on some alarms you can't arm or disarm with the remote when "passive arming" is enabled. Now if it were just a keyless entry system, I'd say yeah, go for both, because you can. However, based on what I got from the info on that alarm, they're talking about passive arming versus active arming and usually you can only have one or the other. Passive sucks because when your car is off, the alarm is on, whether you want it to be or not, and that's just plain gay. That alarm has keyless entry and a 2nd channell output for a turnk release. All you need to make those work is a few relays, unless you already have power locks and power trunk with relays operating them. Then all you do is use the trigger wires from the alarm to operate the lock/unlock and trunk pop relays. Most OEM or aftermarket power lock and power trunk release setups don't use relays. I did when I did my truck, simply because I didn't know what amperage rating the switches I pulled out of a SUbaru had, so to play it safe, I used the switches to operate relays which themselves use very low amperage to operate, and kept all the power switching duty on the relays, which I knew had contact ratings of 20Amps continuous and 30Amps momentary.