Simplex 4903-9425 TrueAlert Non-Addressable Horn Strobe

The Simplex 4903-9425 TrueAlert is a non-addressable audible and visible fire alarm notification appliance designed for conventional 4-wire fire alarm circuits. This wall-mounted horn/strobe combines an electronic horn with a high-output strobe in a compact, rugged housing. The 4903-9425 features a red cover and provides a 15 candela strobe output. The horn produces a loud, harmonically rich sound suitable for continuous or coded operation based on the controlling notification appliance circuit. The strobe can operate in free-run mode or be synchronized with compatible Simplex control equipment. It operates from a nominal 24 VDC system and supports standard electrical box mounting. Its thermoplastic housing is designed for commercial fire alarm applications and provides accessible wiring terminals for installation, inspection, and testing.