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 centerline, with a gap of less than 10 mm 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°C-50°°C Package Included: 1 * wifi door/window sensor (without battery) Door and window alarm WiFi door detector