I am thinking of installing an X10 system in my home however I do not have a land line. My wife and I only use cell phones. Is there a system that is suited for this application? Is there one that will just alarm and not call, as well if there is a product like this how long will the alarm sound before being shut off? Would it work to install the voice dialer and just not hook it up to a hard line and if so will it ever cut off if it cannot reach someone?