Compliant With Both Alexa And Google Assistant, The Heiman Wifi Door Sensor Is A ?WIFI Connection Real-Time Alerts? By connecting WIFI (2.4G only) and mobile phone connection, whether you are at home or on the go, the intelligent WiFi contact sensor sends a notification to notify you when the door / window is open or closed (Note: Support only: Wi-Fi 2.4 GHz.) ?Easy To Use? Easy set up of the sensor for open doors in a few minutes - without tools or professional installation. Add components for overall house protection at any time. No hub or subscription service is required. Simply connect it to your Wi-Fi network and download the "Smartlife/ tuya"app from the App Store. No monthly fee! ?24/7 Pro Monitoring?: Door window sensor offers round the clock monitoring of your home. Use on doors, windows, cabinets, drawers or anywhere you want to notified when it is opened or closed. It's easy for you to keep an eye on the security of your house anytime anywhere. ?Long Battery Life?: Door sensor with low power consumption offers a battery life of approx more than 1 year. The super long battery life avoids frequent replacement and gives you a better experience. ?Widely Application? Install the alarm sensor not only on front doors or windows, but also on garage doors, liquor cabinets, front gates, lockers, pet doors and more. And we offer replacement or refund if you have problems with your Smart Door Window Alarm Sensor.