[Gaffer]

Should we call the police because you have a digital watch or a cellphone?

Frankly, if you put it in a suitcase with room enough for C4 and a detonator like the example of this child's experiment, and take it to a school, yes.

Secondly, the driver circuitry for the detonator is probably already there in the alarm output that drives the buzzer.

[thesligoduffyflynns]

A astute reply- & to the point ! thanks