Reddit reviews Kidde Safety - 21026055 Kidde Sealed Lithium Battery Power Smoke Detector Alarm | Model i9010, White

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 alarmSelf-activation – Alarm automatically activates when attached to the mounting bracket, HushTM – Will temporarily silence nuisance alarms and will not allow hush mode to be activated unless the unit is in alarm modeAlarm memory – Rapidly flashing LED alerts user if the alarm has sounded since the last time the test/reset button was used. Temperature Range-40˚F (4.4˚C) to 100˚F (37.8˚C)End of life warning – Alarm chirps every 40-45 seconds indicating the alarm is in need of replacement, Tamper resist – (when activated upon installation) effective in preventing someone from removing the unit from the mounting bracketTest/reset button – Tests unit’s circuit operation and resets memory after an alarm condition occurs, LED – A flashing red indicator light with four modes of operation: standby, alarm mode, hush mode, and memory setSealed in lithium battery never replace battery over the ten-year life of the alarmSelf activation alarm automatically activates when securely attached to the mounting bracketSmart hush temporarily silences nuisance alarms and will not allow hush mode to be activated unless the unit is in alarm modeRapidly flashing red LED alerts the user if the alarm has sounded since the last time the test reset button was usedKidde's smoke alarms meet the requirements of Underwriters Laboratories (UL), an independent facility that tests products for compliance with widely-accepted safety standards