The dead man's trigger was a heart rate monitor and radio transmitter worn by Martin Keamy. It acted as a fail-deadly device that would trigger the destruction of the Kahana in the event of Keamy's death. Omar strapped the dead man's trigger to Keamy's left arm inside the armory of the freighter Kahana. The device consisted of a strap worn around the waist with a raised section in the middle and a smaller rectangular unit with a two-color light; green represented the heart beating and red represented the heart stopping.