Product Description: Smart siren announcements will send instant push notifications to your phone when the door is active Family members share a device and use smart life apps with your family Lighting automation, create a smart scene on the smart life application, when you open the door, your smart light can automatically turn on Easy to install, aligned with the center line, with a gap of less than 0.4inch No complicated installation tools are required. In just a few steps, you can install the sensor using double-sided tape or screws (included), and then download the "smart life" app for GooglePlay or App Store to add a device to detect the status of the sensor. Doors/windows. specification: Input voltage: AAA1.5V×2 Current: ≤8μAAlarm Current: ≤70-120 mA WiFi: 2.4GHz IEEE 802.11b/g/n Magnetron distance: ≤10 mM Working temperature: -10℃-50°℃ Receive Real-time Alarms Remotely:when door/window is opened or closed, the sensor will push instant notification to your smartphone immediately. so you don't have to worry about your baby going out of house without notice, will easily know when your aged parents leave or arrive home and even can be clear when someone enters your home,shop,office ,etc. Alert message push: Protect your home with open / closed door detection. When the door / window is triggered, you will receive an alarm signal from your phone. Home Security Alarm make House more safety. Easy Installation：No Need to use complicated tools when installation,just use 3M glue to install,firm and durable.The two arrows are opposite,the distance between the two compopents should be as close as possible,and the closest distance should not affect the opening/clsoing of the door or window. Multiple Uses: Install the Alarm Sensor not only on front doors or windows, but also on garage doors, liquor cabinets, front gate, safety deposit box, pet doors and more. Note: The door sensor itself does not include a chime; However, you can program it to some smart voice devices via Smart Life app; When the sensor triggered open or close, the voice devices will perform as an alarm or bell in 10 seconds