WiFi Door and Window Sensor: Smart Door Alarm Sensor with Free App Alerts and 90db Alarm, Wireless Contact Sensor for Home Security and Home Automation, Compatible with Alexa Google Assistant(4pack) - Gaoducash, wifi alarm sensor

• 90DB SOUND ALARM & FREE APP NOTIFICATION: Whenever the door/window opens unexpectedly, the Smart Door and Window Sensor will activate the local alarm and send an alert notification to your phone. You can also check the alarm History on your app. VOICE CONTROL: The alarm contact sensor is compatible with Alexa and Google Assistant. You can query the opening or closing status of doors/windows by voice. HOME AUTOMATION: The Tuya door Window Sensor can control other Tuya smart connected devices as the status of the door or window changes. For example, Automatically turn on your smart wall switches or lights when door opened. More smart devices can be sync as long as they compatible with Tuya/Smart Life app. EASY INSTALLTION: No hub and other tools needed, just use the included 3M tape to install, firm and durable. You can install the Wireless Window Sensor anywhere, such as door, window, drawers, closet, safe deposit box, fridge etc. LOW POWER WARNING & QUALILTY: Smart door alarm comes with 2 AAA Batteries(include). The app will show the remaining power volume, when it is too low, it will push a low battery notification to your app. We provide 24 months warranty on door alarms for home security