"There's still enough explosive in this fuse to take out half of Mos Eisley!"
―Anonymous Aeropteryx[src]

Atmospheric phase-change detonators were detonation devices for the Imperial-class M-12 sweep bomb in the Imperial Navy. The detonator remained a potent explosive device even after being removed from its bomb host.

The detonator was spherical, with two off-center cylindrical protrusions and only three tiny red LEDs on its thumbnail-sized readout showing whether it was active.

Manufactured by a subcontractor on Kuat through the Kuat Drive Yards, each production ran into numbers of 250,000. Kuat Drive Yards reserved serial designations below twelve million for testing on their heavy cruisers and destroyers' munitions-storage chambers.

By 4 ABY, these detonators had been discontinued due to a near ten percent failure rate in the field. Only a sentient with experience could spot a dud. The Empire replaced them with an integrated gravity-wave system encased inside the main explosive.

Lone detonators found their way into the hands of others, such as Dengar.