Smart Alerts Notice. Get Instant Push Notification to Your Phone When Door Sensor Detects Activity. Family Members Sharing One Sensor. Share the device with your family with Smart Life APP. Lighting Automation Create smart scene on Smart Life APP,your smart light can be automatically turned on when you open the door Easy to Install Align with the middle line,space less than 10 mm. Low Power Technology With a high-performance, low-power microprocessor, battery life is available for 2 years, avoiding frequent battery replacements. Push message When the status of the door and window sensors changes,the mobile app can receive messages in real time to deal with abnormal situations. Small size,easy to install Adhesive installation,can be flexibly placed in doors, ,drawers,etc,without the appearance and structure of the original furniture. Input voltage: AAA1.5Vx2(not included) Quiescent Current: less than or equal to 8uA Alarm Current: less than or equal to 70-120mA Low power undervoltage: less than or equal to 2.7V WiFi: 2.4GHz IEEE 802.11b/g Magnetic control distance: less than or equal to 10mm Working temperature: -10??-50?? Working humidity: max 95%RH colour: white Material: ABS Size: 70x25x20mm Package Contents: 4 x Smart Window Door Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.