Their intelligent sensors alert you before anyone can break in. They are installed on the doors and windows of your choice and trigger a warning message at the first sign of an attempted break-in, as they detect vibrations. The sensors also notice when a door or window is suddenly opened. In such cases, you will be immediately notified via your smartphone. This gives you valuable time in the event of a break-in attempt. Monitor your doors and windows directly through the app: Keep an eye on your home by setting up the app accordingly. This way, the sensors can alert you via your smartphone as soon as a door or window has been left open for too long. Are you already on the go and have doubts? Check whether all doors and windows equipped with sensors are open or closed. Installing your sensors is hassle-free: Maximum intelligence and simplicity – that's the motto of Netatmo products. These door and window sensors are no exception. The single-piece sensors are waterproof and can be easily stuck to any door or window, regardless of the brand. And for them to work, only a smart indoor camera from Netatmo is required. The door and window sensors, together with the smart indoor camera and the indoor alarm siren from Netatmo, form a complete alarm system that protects your home and responds immediately in the event of a break-in. You can even trigger the alarm siren through a selected sensor. The alarm siren and the sensors only work with the smart indoor camera from Netatmo. A maximum of 1 alarm siren and 12 sensors can be connected per camera.