Computer programs [downloadable software]; computer programs, recorded; modems; network communication equipment; smartphones; galvanometers; dynamometers; frequency meters; voltmeters; electricity meters; transformers; power distribution boxes; sensors; connectors [electricity]; electric power converters; microcontrollers; electrical adapters; voltage regulator; power controllers; inverters [electricity]; photovoltaic inverters; step-up transformers; thermostats; climate control digital therm...