The blue lock and the red ! buttons are mode switching buttons. Kind of like TV and Cable on a universal remote. They change the functionality of the buttons below them, but don't send any commands themselves.
The blue lock is the arm mode and is selected by default when the application loads. This gives you access to all your arm and disarm buttons as well as security light on/off.
The red ! button changes into panic mode. This displays a giant panic button, as well as an off button to disable the panic.
We broke up the interface into 2 modes, because with such a small screen space (mobile phones), it was just too easy to accidentally hit the panic button. I am constantly accidentally hitting the panic button on my truck's keyless entry system, so I wanted to make sure no one had that problem with our software.