SONOFF DW2-RF – 433MHZ RF Wireless Door/Window Sensor

【Alert Notification & Camera Binding】By receiving a push notification, monitor your home more reassuringly. You can also add a camera to check the real-time status. 【Smart Scenes】Open the door to trigger lights on/off. There are more scenes that you can customize. 【Low Power Consumption】Adopots low energy consumption technology to extend the lifespan of batteries. 【Easy Installation】Tool-free installation with the 3M adhesive at back, 【Note】Batteries are not included in the package. RF433MHz Bridge is required.