Communications headsets for use with communication radios, intercom systems, or other communications network transceivers; Computers and computer peripheral devices; Electric door bells; Electrical resistance heating wires and electrical controllers therefor; Electronic devices for animal locating and tracking programmed to use global positioning systems (GPS) and cellular communications; Electronic devices for locating and tracking lost articles, people, pets using radio frequency, global positioning systems, cellular communication networks; Emergency notification system comprised of a data processor and a user input device for connecting the data processor to an emergency response entity through a communication network and allowing audio and data communication between the processor and the entity; Home automation hubs using artificial intelligence comprised of voice-activated speakers, computer hardware, and downloadable software for controlling networked devices in the internet of things (IoT), operating internet-enabled and connected lighting apparatus and home security alarms; Intelligent personal assistant devices comprised of voice-activated speakers, computer hardware, and recorded software for searching the internet for weather and traffic information, appointment reminders; Power-line transmission machines and apparatus