App controlYou can set the alarm arming, disarming and delay time according to your needs, set the alarm volume, automatic anti-theft on time, simple operation by "Tuya" APP. Only work with 2.4GHz 5G WiFi connection will not workSound light alarmWhen someone illegally opens the doors and windows, the siren will immediately send out sound and light alarm, and the alarm sound is superior at 100dB, deterring foreign intruders, and the alarm information will be pushed to the APP immediatelyLow Battery ReminderWireless door opener alert door sensor powered by 2 AAA batteries (not included), the working time can last one year without replacing the battery. When battery is low, it will automatically send messages through APP to remind you to change battery, never worry about running out of batteryReal Time MonitorWhen door/window is opened or closed, the sensor will push instant notification to your smartphone immediately. so you don't have to worry about your baby going out of house without notice, will also easily know someone enters your home, shop, office, etcEasy to InstallEasy to install with the tape we provide, please make sure that the sensor and magnet are aligned and the gap is less than 10 mm. If you have any questions, please feel free to contact us, we will be happy to solve your problems Note: The data are all manual measurement, please allow 1-3cm error, due to Due to the light and display difference, there will be some color difference, depending on the physical item received.