Potter PAD300-LFSB Low Frequency Sounder BaseThe Addressable Low Frequency Sounder Base (PAD300 LFSB) is a sounder base that may be utilized in a variety of applications. The base has a locking feature for the detector that may be used or removed in the field. Once the head is removed, the sounder is accessible in the bottom of the unit. The PAD300 LFSB low frequency sounder base is designed to meet NFPA 72 sleeping space requirements to produce a frequency of 520 Hz + 10% with a square wave. It