SL-21 Optical-acoustic alarm, 12 V, IP44, label with description
SL-21 sirens are designed for visual and acoustic signalling of alarm conditions on 12VDC alarm outputs of MD, MDP, MDD type control modules or WG.NG and AirTECH type detectors.
The sirens have a splash-proof construction, i.e. they can be used both inside and outside buildings.