This guard unit features a high-quality aluminum panel, without a redundant button, giving a neat and simple feel. The local HD camera also provides a good visual experience for the user. Monitor any Door station, two –way communication with all users,review and save the alarm records.Remote Door opening for visitors, Record of alarm and call information.Security guard calls Room-stations,Security guard monitors Door-stations,Door-stations call Security guard.Connect computer for visual and powerful management.