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Transformers; current transformers; high-voltage transformers; distribution transformers; frequency converters; electronic power transformers; electric voltage transformers; capacitive voltage transformers; electrical transformers for telecommunication apparatus; electric current control devices; power connectors; electronic power supplies; high-voltage power supplies; low-voltage power supplies; high-frequency switching power supplies; DC input power supplies; power supplies with usb connector; power supplies for antenna amplifiers; chargers for electric accumulators; battery chargers, electric; portable power chargers; battery chargers; batteries; uninterruptible electrical power supplies; voltmeters; voltage testers; voltage monitor modules; voltage detectors; voltage regulators for electric power; voltage monitoring units; voltage stabilizers; sensors for measuring and monitoring the quality of electricity; sensors for measuring and monitoring air quality; sensors for measuring and monitoring the physical operating quantities of a machine or a molding process; remote temperature sensors; computer network routers; wireless routers; USB wireless routers; Internet of Things (IoT) range extenders in the nature of antennas; data processing equipment