WiFi Smart Smoke Detector with Siren

The built-in special IC, stable performance, high sensitivity;The optical principle smoke measure the room,can accurate detection or fire from the early smokeCan simulate alarm test for alarm;9V battery power supply,Surveillance state current less than 10uA,alarm current less than 12mA;Voltage alarm function. When the battery voltage is lower than 6.8V,issued a prompt remind users change the battery;Alarm volume:   85DB;