The Simplex 4906-9131 is a TrueAlert® weatherproof multi-candela horn/strobe designed for wall-mounted audible and visible fire alarm notification in indoor or outdoor applications. This non-addressable 24 VDC appliance features a NEMA 3R rated enclosure suitable for extended temperature and humidity environments. The strobe intensity is field-selectable, and the unit supports SmartSync two-wire operation, allowing independent horn and strobe control on the same NAC. The polarized input connects to compatible reverse polarity supervised notification appliance circuits. The 4906-9131 is UL and ULC listed and FM approved for regulated 24 VDC operation.