Battery operated, RV approved, ionization smoke alarm with lighted power and alarm indicator, 9 V battery included. With silence feature. Ionization smoke sensors are generally more sensitive at detecting small particles, which tend to be produced in greater amounts by flaming fires. Tamper-resistant locking pin. Hinged cover for easy battery replacement. Meets ANSI/UL217 standard.

Designed to help promote household safety, the FIRST ALERT 9120B hardwired smoke alarm with battery backup can provide a vital early warning of fire. This hardwired smoke detector uses an ionization smoke sensor to reliably detect smoke from hot, fast-flaming fires.