This wonderful product is a 3.5" LCD CMOS color wireless IR video intercom doorbell system.Adopting micro processing technology, this video door phone intercom system is durable and reliable enough for long time using. Also video door phone intercom ensures a stable good performance and digital automatic control. When the doorbell is ringing, the picture of the visitor will be automatically displayed on the screen. You can even communicate with them without opening the door at all. This video door phone system provides an extra security and convenience for you and your family. With the electric lock-control function and hand-free intercom, this video door phone intercom doorbell system must be a prefect safeguard for your family.Owning this video doorbell intercom system, you can free yourself from worries. Also your family life will be refreshed.