- Real-time alerts: Connects to WiFi and your mobile phone so you receive an instant notification on your phone when a door or window is opened or closed, whether you are at home or on the go. - Flexible installation: Suitable for front doors and windows, and also for garage doors, spirit cabinets, entrance gates, lockers, pet doors, and more. - Voice assistant compatibility: Compatible with Alexa and Google Home. No hub required and no monthly fees. Pair the Smartlife app with Alexa or Google Home to check the status of your door sensor without using your phone. Useful for knowing when doors, windows, cabinets, drawers, or other monitored areas are opened or closed. - Easy setup and long battery life: No complex tools required for installation. A video guide on the main page shows how to add the sensor to WiFi and Alexa. Low power consumption delivers long battery life with infrequent replacements.