Kidde i12060 Hardwired Smoke Alarm with Front Load Battery Backup Smoke Alarm Front load battery door provides easy access which reduces the installation time and battery replacement time Battery pull tab prevents draining battery until permanent AC power is connected Hush feature temporarily silences nuisance alarms One touch test button tests unit's electronic circuitry.Kidde?s smoke alarms meet the requirements of Underwriters Laboratories (UL), an independent facility that tests products for compliance with widely-accepted safety standards Temperature range:40F to 100F