This is a mobile phone doorbell, supporting the development of mobile platform based on P2P software doorbell. As long as the customer purchases a doorbell, doorbell and download and install this software Google market. When visitors press the doorbell, phone and doorbell can be achieved through the video calling software. And by remote unlocking software lock function on, give your life to bring more convenience. It is another very useful feature is the motion detection alarm when someone stays at a certain time and not before the doorbell rang the doorbell, doorbell system will be timely sent to the user in front of the situation of the mobile phone for the user to take photographs, video evidence or property reported deal with.