Bluetooth-operated Door/Window sensor. To use this device with the Shelly Smart Control app, a gateway is necessary. Compatible gateways are Shelly BLU Gateway or any Shelly Plus, Pro or Gen3 device (excluding sensors). Smart Security Starts at Your Door. Introducing the Shelly BLU Door/Window Sensor with LUX and tilt angle measurement. This advanced sensor is designed to detect openings and report them immediately, triggering home automation scenarios accordingly. Whether you want to enhance home security, automate lighting or monitor access, Shelly BLU Door/Window sensor adapts to your unique needs. Its compact and stylish design allows for easy installation on doors, windows, safety gates, garage doors and more. With its seamless integration into any interior, it effortlessly fits the aesthetics of your living space. Use cases Protect your home, even when you're away Always be informed of any unwanted guests. Simply place Shelly BLU Door/Window on your front door, balconies, windows or garage door and receive a notification if someone opens them while you are away. But that's not all. Shelly BLU Door/Window can be used as part of your security system using automation scenarios or scenes. It could activate other devices to protect your home when unexpected activity occurs at your premises.