Kidde I12060 Hardwire with Front Load Battery Backup Smoke Alarm, 8-Pack 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