I believe that there is something like this which exists already. However its purpose is that it stops thieves by way of noise. When a button is pushed (mostly when someone is being mugged or something) the device emits a lound high pitched noise making everyone around turn and look. This deters a theft attempt. However wouldn't it be a good idea to have a small pocket sized device with a button that, when pushed dials an emergency services number, and has a homing becon. Say that you are in a car accident or something in the middle of nowhere, and you can hardly move. You could push this button and it would dial out, alerting the ES to your whereabouts. I thought it was quite a good idea - what do you think?-- anon52, May 04 2004 Emergency Position Indicating Radiobeacon http://www.navcen.u...mms/gmdss/epirb.htmNot likely pocket sized. [half, Oct 17 2004] Help! I've fallen and can't get up!-- half, May 04 2004 We're calling paramedics [press] and your family, Mrs. Fletcher!-- phundug, May 04 2004 Old people get these in homes!-- MikeOliver, May 04 2004 random, halfbakery