Gentex 8243PY Smoke Alarm, 24V Hardwired System Photoelectric Non-Latching w/A/C Contacts & T3 Horn (908-1214-002) Listed for releasing device service Horn frequency 3100 Hz (nominal) Temporal 3 evacuation sounding device Patented three position test Nominal 2.5% sensitivity Easy Wash on-site maintenance washing program Form A/Form C dry relay contacts Quick-disconnect wiring harness 5-to-1 signal-to-noise ratio Pulsing LED sensing chamber Fully insect screened Solid-state LED condition indicator Mounting hardware adapts to standard junction boxes Dust cover to prevent contamination during installation Prote