Basically, this is two-way alarm, so in a package you will get one two-way remote with LCD display and 4 buttons, with this you can not only control your car from your home, but also program your alarm's functions. It works on FM communication, you can check the car from distance 2000m (this distance shorten in town between buildings). On LCD screen you can see what happens with your car.
This alarm also comes with pager (for two-way remote) and knock-sensor. This sensor is on the windscreen of your vehicle, you can open your car by knocking special code you choose, or someone can call you to your car. Remote will then flash and beep. Of course, there are other features like arming with last closed door, silent arming, auto-rearming, automatic disarming/arming according to distance from the vehicle, panic mode with ignition off (when someone tries to steal your car, you simply press a button and the engine will stop). On remote you can also check voltage of the battery and inside temperature of the car.
This is probably the best alarm I have had.
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