Andyssey Smoke Alarm 9V Battery Replaceable, Photoelectric Sensor with Test Button, Low Battery /Fault Warning for Bedroom/Living Room Compliant with UL 217 Standard GS528A-3

【10-Year Lifetime with 1-year 9V Replaceable Battery】battery powered smoke detectors will last 10 years; the device includes one year 9V battery, easy to replace it
【Photoelectric Sensor for Accurately Detect】Photoelectric sensor smoke alarms helps to monitor smoke and fires quickly, provides the warning of fires as soon as possible
【Test-Silence Button and LED Lights】Smoke alarms are easy to test by pressing the button for more than 5 seconds；This smoke alarm is equipped with a red LED indicator