Even when you're going out , to notify the call of your home intercom. Then , you can confirm the image of the visitor in real time . It is also possible to talk and unlock auto-lock. [Primary function] Confirmation of history information of visitors ( time and image ). Indicating that the intercom is being called. [Precautions] Dedicated intercom system is required. For the correspondence of propriety, Please contact the apartment management company . Please you are sure that you hav