Product specifications: Material: ABS Dimensions: 8 x 3.8 cm Power supply: 2 x 1.5V AA batteries (not included) Detection range: 20 square meters Contents: 1 Wi-Fi smoke detector + instruction manual Product features: Alarm notification: Connect the Wi-Fi smoke detector to the Tuya Smart or Tuya Smart Life app to control it remotely. Control your smart smoke detector remotely via the app and receive instant notifications in case of alarm, fault or low battery. (Note: Please use a 2.4 GHz network; 5G networks are not available.) Advanced: Thanks to advanced photoelectric and electrochemical sensor technology, it detects even the largest combustion particles and effectively reduces false alarms. If smoke is detected, an alarm above 80 decibels is triggered. Automation: This Wi-Fi smoke detector easily connects to other Tuya connected devices. You can set conditions in smart scenes, such as activating the red light if smoke is detected or immediately starting the extractor fan. Test/Silence button: Test your smoke detector every week by pressing the Test/Silence button. This Wi-Fi smoke detector continuously checks its circuits, electronics and battery status to ensure proper operation. Note: All dimensions are measured manually, so errors may occur. Thank you for your understanding! Please measure the dimensions before purchasing! If you do not understand how to use it, please contact us!Smoke alarm - white *1