1. You can check the conditions in front of the door anytime and anywhere. 2. When you on the vacation or working office,bed rest. 3. You no need to wait for someone press the doorbell and you can see the condition when you use your phone. Features: wireless connection, ultra-low power consumption, remote active , fast start-up. Usage: Guests can make video voice calls and make short-time videos when visiting, so that the host can know the information of the newcomers without opening the door. mode doorbell button , PIR human body detection , mobile phone active . Products without batteries need to bring their own batteries. Color: As Shown Material: plastic Package Contents: 1 x doorbell 1 x ding- machine 1 x instruction