Sonoff DW2 Wi-Fi Wireless Door and Window Sensor with APP Push Notifications Connect with Sonoff Switch Light Works with Alexa, Google Home

The DW2-WIFI Wi-Fi Wireless Door Window Sensor Reminds you when the door/window is opened or closed. Keep linkage with SONOFF smart products for your easier smart life. No gateway is required. The sensor is paired with the APP via Bluetooth and is controlled on APP via Wi-Fi. Worry about leaving your door or window open /closed? View instantly the status of your home on the APP. The sensor will send you a push notification immediately if someone is detected opening your door or window. Add a 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. Want the hallway to light up when you walk into the door and light off when you walk out the door? Simply connect the SONOFF switch or SONOFF light to the sensor and go "The condition and performance must be set on different devices". Check the open and closed status of your door/window via Alexa or Google Home, not just on your mobile phone. There is a reminder on APP if the battery level of the sensor is low. Automatically save message notifications. You can check history records over the last 3 months. Tool-free installation. Adopts 3M adhesive on the bottom of the sensor for easier installation "Make sure the installation gap is less than 5mm when the door or the window is closed