€¢ Voice Alarm - Unit announces 'Fire! Fire!' in addition to loud 85 dB beeps when smoke or fire is detected €¢ Sealed-In Lithium Battery - Sealed-in lithium power supply; no battery replacement required over the 10 year life of the alarm. Eliminates worry about battery removal or unauthorized deactivation of alarm €¢ Photoelectric sensor - Advanced photoelectric sensor may detect visible particles (associated with smoldering fires) sooner than ionization alarms €¢ Self Activation - Alarm automatically activates when attached to the mounting bracket €¢ Alarm memory - Rapidly flashing LED alerts user if the alarm has sounded since the last time the test/reset button was used €¢ Test/Hush Button - Tests alarm circuitry and activates Hush features €¢ Smart Hush - Temporarily silences nuisance alarms for approximately 10 minutes and will not allow hush mode unless the unit is in alarm mode €¢ LED - Red LED will blink in conjunction with the alarm sound €¢ End of Life Warning - Alarm chirps every 30 seconds to indicate the unit is in need of replacement >> The Kidde P3010B is a 10-year; sealed battery; smoke alarm with photoelectric sensing technology and Smart Hush feature. The 85 dB alarm tone is accompanied by a voice warning feature. The alarm will automatically activate when it is attached to the mounting bracket; there are no pulltabs; no switches; everything is automatic. At the end of alarm life; the unit will chirp; indicating the alarm is in need of replacement. The customer can use a simple tool such as a screwdriver to deactivate the unit; stopping the chirp and making it safe for disposal. The P3010B contains a 10-year tamper proof battery that eliminates the need for battery replacement; and ends worry of unauthorized battery removal. The alarm provides continuous protection from smoke and fire; even during power outages."