1-10PCS SONOFF DW2-RF 433MHz Wirele Door Window Sensor Works with SONOFF RF Bridge EV1527 Smart Scene Home Secuirty Device Doors and windows as the entrances and exits are the weakest points of your home. An unsecured door or window is like an obvious WELCOME sign, to a burglar, so door/window sensors are also known as entry sensor. As one of the most popular home security devices, DW2-RF wirele door/window sensor is enough smart to get you to know whether your door or window is open, and it can not only send you alert notifications, but also make you know when the entrance point is opened, making sure your home is safe.More importantly, the sensor allows you to add a security camera or old smartphone to view who is entering your home, providing you with more details and notes about the uninvited guest. Can sync the opening status of door/window to app which gives you a peace of mind when youre not at home. History records check can be traced back to the last 3 months and this can help you look back and check the condition of your home at that time. Lights are triggered in the action. You can set the linkage in the smart scene of the eWeLink app to connect the sensor and your light so that you can open or close the door to trigger the hallway light on and off. The SONOFF Bridge is required for making this linkage poible. Combines with IFTTT service, the sensor can be used to trigger more devices or routines. This device sharing feature is for letting more of your family know your home is secure. After sharing the sensor, all of the shared users will receive the alert about the condition when someone opens the door. The sensor is 3M adhesive installed, easy to move and remove. It can work just fine upside down and sideways, as long as the magnet is le than 5mm from the sensor, which makes no difference how the sensor is located. Its battery operated and has a low power consumption that ensures the battery life can last up 2 years. Always Know Whether Home Is Safe The sensor will send you a push notification immediately if someone is detected to open your door or window. Can See Who Came into Home Add SONOFF camera or an unused smartphone, and you can view what's going on in your home not just receive the alert notification when the door is opened. Conserve Battery Life Adopts low energy sonsumption technology which makes sure the sensor works up to 2 years in a frequency of opening/closing door three times a day. Security in Each Corner inside of Home Go Back to History Record Automatically save meage notifications. You can check history records over the last 3 months. Made Smart in the Action Want the hallway to light up when you walk into the door? Simply connect the SONOFF switch or SONOFF light to the sensor and go. Install in Second Tool-free installation. Adopts 3M adhesive on the bottom of the sensor for easier installation. Product Detail