Personal security systems and alarms and other communication devices; personal alarm units, call fobs, personal pagers, network pagers and integrated pagers; repeaters and system integrators, interfaces and central hubs; two-way radios, location beacon systems; mesh radio networks, base stations; personnel locating devices; devices for locating and tracking assets, telemetry devices; apparatus and equipment for monitoring plants, factories, offices, hospitals and other institutions; wireless transmitters for use in emergency communication