Feature: 1. Security: This door and window alarm sensor provides security and peace of mind as you keep a close eye on the safety of your children and elderly and catch potential burglars trying to infiltrate your home. 2. High Sensitivity: This door and window alarm sensor sends a notification to your smartphone if a window or door is opened or closed when you are not at home. 3. WIFI Door Magnetic Alarm: This door and window alarm sensor has a separate WIFI door magnetic alarm that detects in real time if doors, windows and drawers have been opened and closed illegally. Remote monitoring allows you to check the status of doors and windows anytime, anywhere using the free for TUYA app. 4. Wide Application: This door and window alarm sensor is perfect for homes, flats, mobile homes, dormitories, offices, hotel rooms, garages, etc. Battery (not included) powered, easy for you to change the batteries and easy to install with stickers. 5. Easy to Install: The sensor is easy to install and requires no wiring or drilling. Simply attach the sensor to the door or window using the included adhesive strips, and it will begin monitoring the opening and closing movements. Specification: Item Type: Door Window Alarm Sensor Material: ABS Battery: 2 x 1.5V LR03 batteries (not included) WiFi: 802.11b/g/n Alarm Sound: ≤ 90dB 1m. Package List: 2 x Door Window Alarm Sensor2 x Adhesive2 x Screws2 x Expansion Tube1 x Card Pin1 x Instruction Manual