DoorBird IP Video Indoor Station lets you see, hear, and speak to visitors at your door from anywhere in the world using your smartphone or tablet. It connects to your existing Wi-Fi network and can be easily set up in minutes. With its built-in camera, microphone, and speaker, you can see and talk to visitors in real-time, and even open the door remotely. The station also has a built-in motion sensor that will send you an alert if someone is at your door, even if they don't ring the bell.