This product is an intelligent smoke detector that uses MCU to intelligently process photoelectric signals with high stability and small sensitivity drift. It has functions of dustproof, insect proof and white light interference, can ensure product stability. Suitable for fires in home, factories, shopping malls, hotels, offices, teaching buildings, banks, libraries and warehouses. Features: 1. It has functions of dustproof, insect proof and white light interference, can ensure product stability. 2. Optional wireless networking capabilities to meet a variety of installation environments. 3. Visible smoke produced by slow smoldering or bright burning, can provide better reflection. 4. Suitable for fires in home, factories, shopping malls, hotels, offices, teaching buildings, banks, libraries and warehouses. 5. The low battery voltage reminds you to replace the new battery and ensure that the product is used normally. 6. Automatic reset without manual reset. 7. Sound and light alarms indicate alarms. Infrared photoelectric sensor, efficient and stable sensing. 8. SMT industrial manufacturing, strong stability. Specification: Working power: 9V battery (Not Included) Quiescent current: <10uA Alarm current: <20mA Frequency : 3±0.5KHZ Sensitivity: 2.06% / ft ± 1.3 Alarm sound pressure: ≥85dB/ 3m Launch distance: 200 meters Working temperature: -10 ° C ~ + 50 ° C Relative humidity: ≤95% RH Executive standard: GB4715-2005; En14604; UL217 Package list: 1 * Smoke Detector 1 * English manual 1 * Screw bag 1、It has functions of dustproof, insect proof and white light interference, can ensure product stability. 2、Optional wireless networking capabilities to meet a variety of installation environments. 3、Visible smoke produced by slow smoldering or bright burning, can provide better reflection. 4、Suitable for fires in home, factories, shopping malls, hotels, offices, teaching buildings, banks, libraries and warehouses. 5、The low battery voltage reminds you to replace the new battery and ensure that the product is used normally.