Each home security system has its own set of cues and meanings, and you'll need to consult with your manual to work them out. There are, however, a few universal warning sounds used for most household ...

You can use any sound you want for an iPhone alarm, and here's how to set it up.

A concerned woman pushing a button on her smoke alarm. - Chameleonseye/Getty Images Each home security system has its own set of cues and meanings, and you'll need to consult with your manual to work ...