Feature: 1. DOOR WINDOW SENSOR: If a window or door is opened, the high sensitivity wireless door window sensor will send a notification to your smartphone. 2. MAIN FUNCTION: Independent WiFi door magnetic alarm, real time detection of whether door and window have been illegally opened and closed. 3. APP CONTROL: The intelligent door detector supports remote monitoring and checks the status of door and window at any time using the APP. 4. APPLICABLE PLACE: The door sensor supports voice control, and perfect for homes, apartments, mobile homes, dormitories, offices, garages, etc. 5. EASY OPERATION: The wireless door detector is powered by batteries (not included), convenient to use, and installed with stickers, stable and reliable. Specification: Item Type: WiFi Door Sensor Material: ABS Battery: 2 x 1.5V LR03 Battery (battery not included) WiFi: 802.11b/g/n. Package List: 2 x Smart Detectors2 x Adhesive Stickers2 x Screws2 x Expansion Tubes1 x Pin1 x User Manual