AEGISLINK Smoke Detector 10-Year Battery with Test/Silence Button, Fire Alarm with Photoelectric Sensor, Low Battery Warning, S500 (Independent, 1-Pack)

10-Year Battery: This smoke alarm comes with a sealed lithium battery with a full 10-year product life, giving you confidence that you and your circle of relatives will probably be safe for a decade
Easy to Install: Use the included accessories to mount the device onto any wall or ceiling; measuring only 3 in (78 mm) in diameter, this mini smoke detector is a stylish complement to any interior design
Test/Silence Button: Means that you can test the device to verify its LED and buzzer are working properly, and silence unwanted alarms with the simple push of the button
Self-Test Function: The smoke detector has an automatic self-test function that checks its sensor, electronics, and battery each and every 60 seconds to be sure that it’s functioning properly
Wide Coverage and Loud Sound: The fire alarm covers a big floor area of 215–430 ft² (20–40 m²); when it detects a problem, it emits a loud sound of over 85 decibels, enough to get up even the deepest sleepers, anywhere in the house