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Kaluach Kir can be used in many ways in the synagogue. For the sanctuary or beit midrash, where a static display is desired so as not to annoy those praying or studying, the screen only updates when information relevant to the tefillah has changed - based on changes in the Hebrew date or pertinent zmanim (halachic times).
For the lobby or entrance of the synagogue, additional screens can be added for special events or semachot.