React before burglars break in. Your smart door and window sensors notify you before someone intrudes. They are installed on doors and windows of your choice and trigger a warning alert in case of attempted break-ins, as they detect vibrations. The sensors also recognize when a door or window is suddenly opened. In such cases, you will be promptly alerted via your smartphone. This gives you valuable time during a break-in attempt. Monitor your doors and windows directly through the app. Keep an eye on your home by configuring the app accordingly. This way, the smart door and window sensors can alert you if a door or window has been left open for too long. Are you already on the go and have doubts? Check all doors and windows equipped with sensors for open or closed states. Install your sensors effortlessly. Maximum intelligence and simplicity: that's the motto of Netatmo products, and these sensors are no exception. The single-piece sensors are waterproof and can be easily attached to any door or window, regardless of the brand. For them to work, only a smart indoor camera from Netatmo is required. Treat yourself to comprehensive protection with a smart alarm system with a camera. The smart door and window sensors, together with the smart indoor camera and the smart indoor alarm siren from Netatmo, form a complete alarm system that protects your home and reacts immediately in the event of a break-in. You can even trigger the alarm siren through a selected sensor. Delivery includes: 3 door/window sensors, 3 x 2 AAA batteries, double-sided sticker, user manual.