Unauthorized Entry DetectionWhenever the door/window opens unexpectedly the Door and Window Sensor will send an alert notification to your phone and activate the local alarm. Features: Ultra-low power consumption program control processing technology Support IOS and Android system WiFi standard IEEE802.11b/g/n wireless standard Note: Only 2.4Ghz Wifi is supported, dual-band WiFi(2.4G and 5G), need to set up a separate 2.4G channel. The smart door sensor is compatible with Amazon Alexa and Google Assistant; Simply give a voice command to check if your door is open or closed. Through the Tuya Smart or Smart Life app, enter the third-party voice control interface and add Alexa or Google Assistant. After a successful connection, the status of the door sensor can be queried by a simple command. When asked by voice, please note that the name of the sensor is the same as the App. For example, the door sensor added in the app is named "front door". You can say, "Alexa, is the front door open?" Package includes1*Mini Door Window Sensor