PB-69W WIFI Smart Wireless Magnetic Door and Window Sensor Features: 1. Consists of a main module and a permanent magnet 2. Ultra-low power consumption 3. It is used to detect whether doors, windows and drawers have been illegally opened or moved. If the position of the main module and permanent magnet changes, the main module will send a warning message to the APP 4. Low battery reminder and real-time battery monitoring function 5. Widely used in smart home, security protection and other fields Product specifications: 1. Working voltage: 3V (2 AAA batteries, need to be purchased by yourself) 2. Working current: 19-59mA 3. Standby current: less than or equal to 35 microamperes 4. Network: WIFI 802.11bgn 5. WIFI distance: 30m (under barrier-free) 6. Installation distance: less than or equal to 2cm 7. Trigger distance: 2-3cm 8. Working temperature: -10-55 degrees Celsius 9. Main module size: 32x76mm 10. Permanent magnet size: 12x46mm