Introducing the Smart WiFi Door Sensor, the easy way to keep an eye on your home, office, HOTEL DOOR or rental property. This versatile door sensor can be used to detect when doors and windows are opened or closed, and will instantly send a notification to your phone. With the free Smart Life app, you can check the status of your doors and windows from anywhere in the world!The Smart Wii Door Sensor is also great for security purposes. If someone tries to enter your home or office without permission, the loud alarm will be triggered, keeping you informed and safe at all times. The Smart Wi-Fi Door Sensor is compatible with Alexa and Google Home for your convenience. Don't worry about losing track of your keys either--the Smart WiFi Door Sensor will keep you updated on whether your doors are locked or unlocked. Make your life easier with the Smart Wi-Fi Door Sensor!