Thanks to BTicino’s "Door Entry CLASSE300X" you will have in your hand all the functionalities of your door entry system. So you will be able to answer and open the door while you're comfortably sitting on your couch or anywhere else in the world, but not only. With “Door Entry CLASSE300X” you can monitor all the cameras of your video door entry system or open the gate, without your keys, when you get home. To use the APP you must have the new BTicino video internal unit CLASSE300X13E. If you have a different BTicino model (in 2 wire technology) in your house, don’t worry, you can easily replace it without any other modifications. This app is guaranteed to be used on smartphone natively including Google services (Google Play Store, Google Play Services). Verify the presence and activation state of Google Play Services in the App menu of your smartphone settings.