Sentinel 10-Year Sealed Lithium Battery Operated Ionization Smoke Alarm 21010576
Sealed in lithium battery never replace battery over the ten-year life of the alarm. Self-activation alarm automatically activates when securely attached to the mounting bracket. Smart hush temporarily silences nuisance alarms and will not allow hush mode to be activated unless the unit is in alarm mode. Rapidly flashing red LED alerts the user if the alarm has sounded since the last time the test reset button was used. Sentinel smoke alarms meet the requirements of Underwriters Laboratories (UL), an independent facility that tests products for compliance with widely-accepted safety standards.