SONOFF SNZB-04 - Zigbee Wireless door/window sensor

【Sync Status & History Records Check】Sync the opening & closing status of door/window. With 3-month history records check, help you master your home security clearly. 【Smart Scenes, Work With WiFi Devices】Simply connect the sensor with your devices, turn on/off the lights when you open/close the door. 【Voice Control & Camera Binding】Want to check your door/window close or not? Just ask your Alexa/ Google Assistant instead of opening your phone. You can also add a camera to the sensor to scare the stranger off with your voice. 【Easy Installation & Low-battery Notification】Using 3M adhesive to easily mount the sensor at your ideal locations. Replace the battery in time with a notification when the battery life is 10% remaining. 【Note】Zigbee Bridge and batteries are required. Keep a distance of less than 80M between SNZB-04 and Zigbee Bridge (open space). Note: The SNZB-04 has been discontinued. We recommend purchasing the upgrade version SNZB-04P. SNZB-04P has improved design and performance. With a tamper alert, 5 years battery life, Maximum installation distance is 20mm.