Computer-controlled apparatus for testing and measuring radio frequency signals, concentrations of gas and liquids, audio signals; Ear buds; Earphone accessories, namely, earphone cushions, earphone pads, earphone cases, and earphone extension cords; Electronic components in the nature of capacitors, connectors, filters, oscillators, relays, switches, transformers, resistors, semiconductors, integrated circuits, rectifiers, transistors; Electronic plant moisture sensor; Fire alarm and emergen...