If deathfire drops his death bomb, when does it detonate?

Let's look at the card!

So, you drop/launch the device as said device would typically allow you to do so. Then, said device would simply detonate when the device says to detonate. If its a Seismic Charge, Proton Bomb, or Bomblet, then like usual, it would detonate at the end of the next activation phase (or the current one, if he somehow died during the phase). If it's a Connor Net or a Proximity Mine, then it detonates when overlapped, as usual.