Many cell phones have a "timer" option....kinda like an alarm clock. That can be set to transmit a signal to the initiator...or device like a blasting cap.
I flunked electronics in HS....someone more fluent in electrons could fill in the blanks here....LOL.
Some crazy moooooos-limb could still stap a bomb to a motor vehicle and have it detonate inside a tunnel this way. The driver may or may not even know he's transporting it.
>>>Many cell phones have a "timer" option....kinda like an alarm clock. That can be set to transmit a signal to the initiator...or device like a blasting cap.
I understand that. But you said it can trigger without a signal.
That is what I don't understand.