The AW-CSS2166-4-11 is a conventional type combined sounder and strobe (sound + light) alarm output device intended for use in conventional fire alarm systems. It uses a 24 V DC input and integrates both audible siren functionality and flashing visual strobe signalling to alert occupants to a fire event. The device is wall mounted and provides clear evacuation signalling via sound and light. The unit is engineered for reliability, easy installation, and effective occupant notification in areas where both audible and visual alarms are required. Key Features: Sound & Light combination device: audible siren + flashing strobe for dual-mode warning; Operating voltage typically 24 V DC; Sound pressure level up to 95-115 dB(A) @ 1 m; Flash rate: typically ~ 120 flashes per minute for the strobe; Easy installation: surface mount, conventional wiring (two-wire or four-wire); Durable construction with ABS red housing suitable for indoor (and in some variants outdoor/weather-proof) use; Visual alarm (flashing light) also aids accessibility for hearing-impaired occupants; Wide temperature and humidity tolerance: e.g., −10 °C to +50 °C, 0–95% RH. Industrial Applications: Commercial – Offices, retail, public buildings; Institutional – Schools, hospitals, clinics; Industrial – Warehouses, factories, plants; Public – Lobbies, corridors, stairwells; Accessible – High-noise or hearing-impaired areas; Retrofit – Existing systems, upgrade projects.