FIRST ALERT FG200 Smoke Alarm, 9 V, Ionization Sensor, Ceiling, Wall Mounting

Battery operated ionization smoke alarm with test button, 9 V battery included. Ionization smoke sensors are generally more sensitive at detecting small particles, which tend to be produced in greater amounts by flaming fires. Beeping signal warns when the battery needs replacing. Hinged cover for easy battery replacement. Meets ANSI/UL217 standard. 3 years limited warranty.