The Kidde P3010L is a 10-year, sealed-battery smoke alarm with photoelectric sensing technology and Smart Hush feature. The innovative design allows for automatic activation once the unit is attached to the mounting bracket; there are no pull-tabs, no switches and everything is automatic. At the end of alarm life, the unit will chirp, indicating the alarm is in need of replacement. Use a simple tool such as a screwdriver to deactivate the unit, stopping the chirp and making it safe for disposal. Never replace a battery during the alarm’s operating life No need to worry about the batteries being removed with sealed-in batteries Sealed-in lithium battery powers alarm for 10 years, the life of the alarm Save up to 40 over the life of the alarm in battery costs Photoelectric sensing alarms may detect visible fire particles (associated with slow smoldering fires) sooner than ionization alarms Alarm automatically activates when attached to the mounting bracket 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 Rapidly flashing LED alerts user if the alarm has sounded since the last time the test/reset button was used 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 End of life indication can be silenced three days at a time up to 30 days to allow for alarm replacement at a more convenient time UL listed Includes 2 smoke alarms with sealed-in batteries