From System Sensor, the SpectrAlert P12015K is a 120-volt wall-mount horn/strobe that is UL Listed for outdoor requirements. The P12015K operates in a temperature range of -40F - 150F and is rainproof per UL50 (NEMA 3R). The product was developed to use in a sprinkler system to provide a visual reference to the alarm location, in addition to the audible alarm traditionally provided by a bell.