Radio stations
     Radio relay communication
     Fiber-optic lines
     Remote sensing monitoring
     Telephone communication
     Internet and data transmission
     Mobile communication
Safety systems
     Complects of security alarm systems
     Doors intercommunication systems
          Video walls
          Memory units
          Multiple door phones
          Constituent, spare parts
     Video monitoring
          Video cameras
          Equipment for computer video monitoring
          Video processing devices
          Quad splitters
          Video transmission
          Constituent, spare parts
     Security alarm systems
          Control and indicating equipment
          Wireless alarm system
          Component parts of wireless alarm system
               Broken glass
               Volume change
          Ir barriers
          Panic buttons
          Fire alarm systems
          Constituent, spare parts