A high-quality base sounder with an impressive 92dB(A) sound output for use with C-TEC’s HP508 Hush-Pro BS5839-6 Grade C Controller. Certified to EN54-3 & 17 by the LPCB. 460µA-5.5mA quiescent current. 5.5mA alarm current. White ceiling fixing plate & detector spur wires included for optional connection to a Hush-Pro detector/base allowing it to be used as part of stacked sounder/detector/base combination. Optional BF330CTLIDW white or BF330CTLIDR red cap available for stand-alone use. IP21C rated. Up to 16 field devices (detectors, sounders and/or I/O units) per Controller.