Wi-Fi Doorbell with Camera and Motion Sensor is a great product that adds the 21st century advancement missing from the regular door bells. Not only can the door bell activate the bell sound by pressing the button, but also incorporates a motion sensor that starts the ring process before the button is pressed. You can answer your door from select Android and iOS devices. It uses Wi-Fi to communicate with the portable devices. Of course, the device has a video camera, microphone and speaker which allows you to see, hear and speak to the person ringing the bell from iOS and Android mobile devices. Multiple mobile devices can be assigned the call to answer it. Once the bell rings, it can be quickly deactivated from the mobile device.