LOL!
Oh... one more comment to the wristwatch thing....The big difference between a watch and a cell phone is that a cellphone battery can set off an electric blasting cap. A watch battery can't... making the cell phone more practical.
Wanna bet?
How much you wanna bet that a wristwatch cannot be used as a timer for any device? Let's say a microwave oven, or a kitchen range, or a water heater (I'm running out of ideas for MAJOR power sinks).
Ever hear of a "relay"? Or an "SCR"? Or a "switching transistor"?
My point on that was merely that a watch battery can't supply enough current to set off a blasting cap by itself ..
I didn't say that it couldnt be used as a timer in a larger, bulkier systm.
Tapping these messages in on a handheld is too laborious to be as pedantic as it appears is necessary to communicate with some, so I'll just give up trying.
Past my bedtime anyway.
One last comment....I have more real experience with explosives than 99.999 % of FReepers...
(ever heard of T.E.R.A. in Socorro, NM???)
Although admittedly it has been 10 years since my last bit of work in that field, so my expertise is a little dated.... but i doubt that the basic principles have changed that much.