Smart Wi-Fi Smoke Sensor, Alarm: when the detected smoke concentration exceeds, Red LED will flash quickly and the buzzer will give out quick “Di-Di-Di” alarm sounds. Hush: when the smoke alarm is alarming, press the hush button, the device will enter hush mode for about 10 minutes; if in low battery warning status, press the hush button, the device will enter hush mode for about 12 hours. Low Battery: When the battery power becomes low, the red LED will flash once and the smoke alarm will issue “Di” warning sound once every 53 seconds. Report alarms to smart phone in real time. Support Wi-Fi Protocol: IEEE 802.11 b/g/n