Electric and electronic, signaling and checking apparatus and instruments, namely, electromechanical and electronic apparatus for connecting, routing, transmitting and testing of audio, video, data and control signals in the nature of electric connectors, network routers, transmitters of electronic signals, switchgears, electronic test and measurement devices for use in the fields of networks and telecommunications in the nature of instrumentation used to test and certify new and existing data and voice communication cable and coaxial cable, transmitters of electronic and optical audio and video signals, electronic monitors and monitor modules for monitoring electric current and electrical signals, electrical power devices in the nature of multimedia outlets, high definition multimedia interface cables, electronic test and measurement devices for use in the fields of audio, video and data networks in the nature of instrumentation used to test and measure telecommunication line integrity testing apparatus, computer-controlled apparatus for testing and measuring audio, video and data signals, electronic switchers for audio and video signals, electronic interconnectors for audio and video signals, electronic products for manipulation of the frequency, time and amplitude characteristics of audio signals in the nature of audio processors, electronic products for generation, measurement, and analysis of audio signal in the nature of audio analyzers, electronic scalers for audio and video signals, electronic switchers for audio and video signals, digital signal processors; apparatus for transmission and reproduction of data, sound or images; data processing apparatus and computers, computer peripheral apparatus; software, namely, software to control and to check interconnections of audio and video switches and routers; components and spare parts for all the aforesaid apparatus, instruments and devices, namely, mechanical and electronic apparatus and printed circuit board components and spare parts for all the aforesaid switches in the nature of electric switch housings, housings for printed circuit boards, patch panels for housing electrical connectors and electrical switches, wireless and network routers and electric connector panels for connecting audio signal input with amplifiers, loudspeakers and power supplies, electromechanical and electronic switch modules for monitoring electric signals and transforming electrical signals from direct current up to 230 alternating current voltage; signal distributor, namely, transmitters of electronic signals and connectors, namely, electronic interconnectors for audio and video signals in the nature of electrical signals from direct current up to 230 alternating current voltage and optical signals