Sonoff RF Bridge lets you perform the functions of 433MHz RF Remotes using mobile app over internet.

By adding the RF wireless Bridge to iOS/Android App eWeLink WiFi wirelessly, you can add up to four 1-4 buttons 433MHz Wireless RF Remotes to the RF Bridge device. After pairing the RF Remote buttons with RF controlled devices, you can directly control maximum 16 RF controlled devices on the App over internet.

It can be used for most of the 433MHz RF Remote controlled products, like RF controlled switch, RF controlled socket, RF controlled bulb, RF controlled door opener, etc. 

Even more exciting is that it will work with door magnetic sensor, human body IR sensor and several other sensors to activate security alarm.