Sonoff SNZB-04

【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).