Farenhyt B200S-LF-WH Sounder Base

,Farenhyt B200S-LF-WH, low frequency sounder base is designed to meet the NFPA72 sleeping space requirement to produce a fundamental frequency of 520 Hz +/- 10% with a square wave or its equivalent. Studies show that a lower frequency, centered around 520 Hz, is the most ideal to awaken sleeping occupants, even those with mild to severe hearing loss