I'm not going to say it wouldn't be possible for an electronic surveillance system alert to trigger the detonator in turn, but that is not part of the package as far as what I'm supplying goes. Other options for him would include having a surveillance system alert him so that he could detonate the explosive, or he could simply lie in wait. [If he's the obsessive sort.]
[phone call]
[phone call]
[phone call]
[phone call]