[Mobile App Alarm Push] Helps you avoid hidden dangers and financial losses. [Smoke Detector Provides Immediate Alerts of Dangerous Smoke Levels] Helps you avoid potential dangers and financial losses. [Smart Linkage]: Works with other Tuya smart door locks and monitoring devices to provide timely assistance and reduce door opening time. [Low Battery Reminder]: Automatically sends a notification when the battery drops below 20%, allowing for timely battery replacement. [Sharing]: Share with family members for shared control. [Group]: Enable or disable group devices together for added convenience. [Recommended Installation Location]: The alarm can be mounted on the ceiling or at an angle. If installed on a pitched or diamond-shaped roof, the angle should not exceed 45 and the distance should be 50 cm. [Flat Ceiling Installation]: The optimal location for the smoke sensor is in the center of the ceiling. Because smoke, heat, and combustibles rising to the ceiling spread laterally, maintain a minimum distance of 30 cm from lights or other decorative items. [Sloped Ceiling Installation]: If the ceiling is sloping, install the smoke sensor at a horizontal distance of 90 cm from the ceiling pendant. [Use Cases] Suitable for a wide range of applications requiring fire alarm monitoring, including homes, lounges, cafes, and dance . (This sensor does not detect gas or heat.) Wi-Fi: 802.11 b/g Power Supply:2 x AAA batteries (batteries not included) Detection Range: 20m Quiescent Current: less than equal 10uA Mounting: Ceiling-mounted Alarm Current: less than equal 120mA Operating Temperature: -10 to 50 Low Voltage Warning: less than equal 2.4V Operating Humidity: less than equal 95% Alarm Level:80dB/1m Quantity:2 Pcs Color:White Material:ABS Package Contents: 2 * Smoke Detector Sensor 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.