BRK Smoke Alarm with Battery Backup and Voice Alerts, Alarm: Voice, Photoelectric Sensor, Battery Power Source, Dimensions: 5.1 in L x 5.1 in W x 2.4 in H, Suitable for: First Alert and BRK Alarms, Includes: Easy Adapter Plug and AA BatteriesPrecision detection advanced sensing technology reduces cooking nuisance alarms and delivers early warningVoice and location alerts tell you the location of dangerLatching alarm indicator visually identifies the unit that initiated the alarm or low batteryBattery backup provides continuous protection during power outagesTest/silence button allows for efficient testing and temporarily silences alarm for up to 8 hrInterconnects with most First Alert and BRK alarms so when one sounds, all compatible alarms sound to provide an early warning