Text: When you are destroyed, each ship at range 1 takes 1 damage.
http://www.fantasyflightgames.com/ffg_content/x-wing/news/scum-and-villainy/dead-mans-switch.png
Put this on something with a low PS, get it in the middle of the enemy, and then fire Assault Missiles at someone near it. Hit them for one, then trigger the Switch to hit everyone again.