Kidde 20SD10-V 10-Year Battery Powered Smoke Detector with LED Warning Lights and Voice Alerts

Alarm Warnings — featuring multi-color LEDs
Fire: The red LED will flash in sync with the alarm pattern (3 long beeps).The alarm will repeat this pattern until the unit is reset or smoke is eliminated.
End of Unit Life: Two chirps and amber LED flashes per minute.
Alarm Memory: Alerts a user if smoke has been detected in the last 24hours. If smoke has been detected, the red LED blinks every 15 seconds

Features & Benefits
Worry-Free 10-Year Battery — No battery changes for 10 years. Avoids inconvenient battery replacements and saves up to $40 over the life of the device.
Self-testing Alarms* — For added assurance, internal components ensure alarm is always operating as expected.
Simple Installation — Easy install with included twist-and-click mounting bracket.
End-of-life Notifications — This alarm beeps to remind you its time to replace it 10 years after it is powered.