1. Smoke sensor and temperature and humidity 2 in 1, not only can detect smoke, but also measure temperature and humidity. Record temperature and humidity changes on APP and present them to you graphically. More intuitively let you know the recent data changes. 2. 80dB(A)* Alarm sound: when the temperature reaches 60 degrees and the smoke reaches a certain value. The alarm is triggered, allowing for a timely response and quick handling. Higher than 60 degrees automatically alarm, the cell phone prompt the alarm. Let you hidden danger and economic loss. 3. Smoke detector reminds the dangerous smoke concentration in time to the potential danger and economic loss. Cooperate with other Tuya smart door lock. Monitoring equipment use, timely rescue, reduce the time to open the door. 4. Low battery reminder, when the power is less than 20 percent automatically push a message to remind, convenient and timely replacement of batteries. Share with family members for common control. You can turn off or turn on the devices in the group together, more convenient. 5. Recommended installation location, the alarm can be installed on the ceiling or tilted installation; if you need to install on a sloped or diamond shaped roof, the tilt angle should not be 45 , the distance is 50cm.WIFI + Bluetooth 2 kinds of connectivity, faster connection to . Wireless Network: 802.11 b/g Input voltage: 2*AAA batteries (batteries not included) Detection range: 20m2 Static current: 10uA Installation: Ceiling type Alarm current: 120mA Operating temperature: -10C- 50C Low voltage: 2.4V Operating humidity: 95% Alarm sound level: 80dB/1m Product size: 90x90x40mm Colour:White Material:ABS Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Package Contents: 4 * Smoke Detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.