Alarm has sealed lithium battery backup, so you don’t need to replace it for 10 years!
Not your average alarm. Upgrading or replacing detectors is easy and affordable when you stock up with this feature-packed dual-purpose model. Voice warning announces “Fire” or “Warning, carbon monoxide”. Combination test and hush button tests the alarm circuitry and temporarily silences nuisance alarms. Two LED displays: red for alarm mode and green for AC power present. Peak-level memory alerts user when the unit has detected CO concentrations of 100ppm or higher. 5 1⁄2" Dia. x 1 3⁄4" D.