Buzzer panels, audio and video monitors, security consoles, accessories and power supply. It is a security monitoring system in which serial connected devices are used under DIGITAL BUS technology. The system is based on the interaction of the devices in the block with the functions of paging, doorbell, communication, monitoring, door unlocking, network and alarm. With the SOS button on all indoor units, direct connection with security is ensured. It saves time with its ease of assembly and installation.