10 Year Sealed Battery Battery-powered wireless home smoke detector; no wiring required, low-drain 3V CR123A lithium battery that lasts the life of the alarm, eliminates worries of battery removal or unauthorized deactivation of the alarm, protection during power outages and not low battery, never replace a battery during the 10-year life of the alarm Insect Net and Smart Photoelectric Sensor anti-insect,never worry about insects or cockroaches crawling into the smoke detectors, which may cause the sensor to malfunction,to prevent small insects from triggering the alarm by interfering with the sensors,high the chip of sensitive smart sensor quickly detects both fast and smoldering fires, while minimizing false alarms TÜV and EN 14604 certified and Wide ApplicationThis fire alarm fire safety is tested and certified by TÜV Rheinland EN 14604 is the strictest certification in the fields of fire safety and protection, electrical fire safety device suitable for home, garage, hotel, apartment, school, hospital, warehouse< /p> Large Silence Button for Test/Reset A self-contained optical fire sensor with a large button helps you easily release false alarms caused by steam, cooking fumes or too much dust, no need to uninstall the whole detector or use the ladder to silence the sounds, you can easily press or hold the reset button for a few seconds to silence false alarms with a stick Low Battery Warning and Self Check 'fire alarm have the functions of power and battery self-checking. In the event of a fault or low voltage, the red LED indicator flashes every 53 seconds. des and buzzer starts short beep,prompt to replace new battery to make sure fire sensor work all year round