Feature: 1. When the fire alarm detects smoke or burning particles in the air, it will emit an 85dB alarm sound until the air is cleared or the test button is released. 2. WiFi smoke detector supports for TUYA, which can be linked with other smart devices in the home to provide a strong guarantee for your home safety. 3. Support mobile phone APP control, when an abnormal situation occurs, a remote alarm information notification will be sent to the mobile phone APP. 4. Using maze technology, the sensitivity is higher, and the detection range is wider up to 20 square meters, so the safety is better. 5. Ultra‑low power consumption, battery‑powered (NOT includes battery) smoke alarms help protect your home and family from smoke and fire. Specification: Item Type: Smoke Detector Material: ABS Input Voltage: DC3V LR03, 1.5V x 2 (not included) Quiescent Current: ≤15uA Alarm Current: ≤220mA Low Voltage and Undervoltage: ≤2.4V Alarm Sound Pressure: 85db/1m WiFi: 802.11b/g/n Detection Range: 20㎡ Installation Method: Ceiling installation Working Temperature: -10℃ to +50℃ Working Humidity: Up to 95%RH Size: Approx. 80 x 38mm/3.1 x 1.5in (Diameter x Thickness). Package List: 1 x Smoke Detector1 x Screw Pack1 x Adhesive Tape1 x Manual