Description:Many fatal fires begin late at night or in the early morning. For extra safety， install smoke alarms both inside and outside sleeping areas. Since smoke and many deadly gases rise， installing your smoke alarms at the proper level will provide you with the earliest warning possible. It can well protect you and your family safety.Main Features:9V battery ( NOT Included )Buzzer: 85 dB in 10 inchesOperating Temperature: 4°C ~ +50°Operating Humidity: 10% - 90%Suitable for home， supermarket etc. Specification:Specification: Type: SafetyFor: AdultsMaterial: PlasticOccasion: Bedroom， Dining Room， Office， Living Room， Home， Kitchen Room， BathroomColor: WhiteDimension and Weight: Product weight : 0.074 kgPackage weight : 0.19 kgProduct size (L x W x H) : 10.5 x 10.5 x 3 cm / 4.13 x 4.13 x 1.18 inchesPackage size (L x W x H) : 15 x 12 x 4 cm / 5.90 x 4.72 x 1.57 inchesPackage contents: Package contents: 1 x Smoke Alarm， 1 x English Manual， 2 x Screw