A security alram which is going-off in a student house, because the occupents have gone away for the weekend/vacation/summer and forgot to supply enough credit for electricity. When the credit runs out the alarm sounds intensly for days until the reserve battery power fails.
These students are a sub-set of alarmer
What's the blasted tone that's been going on for days?
Man, that's the student siren. Those kids have gone away without topping up the leccy