App Presses Alarm Information: Window Door Sensors, Mobile Phone Remote Viewing, You Know What'S Happening In Your Home When You'Re Out. It Will Send Push Notification Message When Your Door Or Window Is Opened. Wireless Alarm System, Let You Know The Alarm Information In An Instant By Cellphone. Depending On The Wifi Network, You Will Receive An Instant Notification And Alarm On Your Phone Within 2 To 8 Seconds. Notice: Only Supports 2.4Ghz.The Wifi Door Sensor Can Be Connected To The Tuya Mobile App: Keep The App Running In The Background. When The Phone Is Locked, The Door Opens And Closes The Alarm With A Sound Push. After Unlocking, Go Directly To The Alarm Page, And Click Directly To View The Alarm Information.Intelligent Linkage To Other Smart Home Devices: Door And Window Sensors Alarm, Linkage With Wifi Smart Light Switch. Set Wifi Tr Magnetic On, Wifi Smart Light Switch On. Set Wifi Tr Sensor Off, Wifi Smart Light Switch Off. Therefore, Lights Turn On Automatic When You Open The Door And Magnetic Door Trigger.