My school uses EST 270-SPOs and red EST Genesis xenon horn strobes in most areas. The gym and the cafeteria use red EST Genesis xenon speaker strobes. The portables use SpectrAlert advances with 270-SPOs, as well as heat detectors. A recently added building uses white EST Genesis LED horn strobes with EST 278 style pull stations under stoppers. The library also has a Potter Select-a-Strobe Horn Strobe inside, but I don’t know what it is for.