Indeed, when it comes to a wireless kit, the central station generally functions as an all-in-one device.  Burglars wishing to break into a property with a wireless alarm system installed can potentially disarm the unit by simply damaging the control panel, which houses the dialer and siren within.  With a hardwired system, however, all of these parts exist independently, so damaging or disarming the device through brute force would take much longer and perhaps be entirely in vain.