Since electronics do not know much about elevation, there are two major
changes - temperature and pressure. The largest change would be a change in
temperature. Unless electronics are heated, there could be a major problem
for displays. Also, batteries may not work as well. Pressure change should
not be much of a problem.

When it comes to radiation, the question is how long the electronics are
going to be up there? Unless it is a very long time, I doubt the radiation
will be a major factor.

Colin