The Gentex Model GCS24/GCC24/GCSA24/GCCA24/GCSB24/GCCB24/GCSG24/GCCG24/GCSR24/GCCR24, horn/strobe and strobe, is a high quality audible/visible or visible signaling appliance intended for ceiling applications. The high intensity strobe utilizes a Xenon flash tube that generates a high-intensity flash visible from all angles. This appliance is intended to provide a visible or audible/visible, depending on the model, notification signal for the purpose of life safety and property protection. This appliance is ideal for any occupancy that requires notification appliances per the applicable building or fire code or wherever dependable alarms are required. The GCS24/GCC24 strobe is listed in compliance with UL 1971, Signaling Appliances for the Hearing Impaired. The GCSA24/GCCA24/GCSB24/GCCB24/GCSG24/ GCCG24/GCSR24/GCCR24 strobe is listed in compliance with UL 1638, Visual Signaling Appliances - Private. Mode Emergency and General Signaling.