Aiphone HM-7 is an all-master home intercom system that enables communication between multiple stations. It features a hands-free design for convenience, allowing users to receive calls without pressing any buttons. The system supports up to 7 master stations and 2 door stations, making it suitable for larger homes or small businesses. With its privacy switch, users can prevent eavesdropping during conversations. The HM-7 also includes a door release button for remote door unlocking, adding an extra layer of security.