RyanGard1977 wrote:More than likely it rings the hallway school bells (if your building is equipped with them, most new buildings now are built without them to save on costs) in the old days, 2 rings would indicate 5 min left and 1 ring would indicate time's up. If it was something you were not supposed to touch, then there would be a "do not touch unless in case of emergency" thing, so go ahead! Push it once, then run and hide!
Minor correction on why bells are no longer included. When they were introduced, it was uncommon for ward to overlap. Now however, it is far more common for the wards to overlap. When wards overlap, it is not uncommon for one ward to be in Sunday School, while another is in sacrament meeting. The result is that if the bells are used, its somewhat disruptive to those in sacrament meeting. Based primarily on these concerns, It was determined the best option was to discontinue the installation of bell systems.
As to the purpose of that button, I have no Idea, if its not a bell button, I have no idea what it is, nor what it is for, more context may help.