Lunch Box alarm You will need a lunch box, some wires, bell or a old phone ringer, a 9 vt battery, tape, and a metal clip. The way my friend did it was. Well we  got a lunch box cover the battery with tape make a hook out of the wire so that the metal is showing and connect the wire to the smoke alarm. Then touch it to a metal clip then when some one opens the hook will touch the metal and that will make the alarm go off.