Skunkabilly,
Have a Cabella's fireproof safe with an electronic lock. What the others said. Beep's when the charge is low and if someone tries to rip off the front panel they will get no where fast.
I have found that even though the pad is not lit, I can usually get the six digit code by "feel"*.
Very useful and I have no worries that someone is going to "break the code" any easier than with a mechanical lock. Does help that the safe weighs @500 lbs. and is against the wall.
Looks great and cost me @$800.00
By the way you brought up "EMP" effects? I was wondering this as well. Properly grounded wouldn't a safe act as a "Faraday Cage"?
I also believe the EMP pulse directly impacts the flow of electrons. If the device has no charge going to it I do not think that an EMP pulse would have any effect. THough I do understand that during testing in the 50's and 60's television tubes would "glow" even when off when exposed to the wide range of electromagnetic energy released.
Me? I keep a few of my more delicate items in the safe and keep some spare batteries throughout the house.
If the Martians invaded and I needed to protect the safe I would either remove the batteries or more than likely keep the safe open. Assuming of course it was open season on the Martians.
Jon
*No superpowers here, just as easy as the "touch-pad" bed side handgun safes they sell.