Antennas; Printed circuit boards; Flexible circuit boards; Housings for printed circuit boards; Circuit boards provided with integrated circuits; Testing apparatus for testing printed circuit boards; GPS tracking devices; Microcontrollers for internet of things (IoT) enabled devices; Electronic circuits; Computer hardware with embedded operating system software; Wireless communication devices for voice, data or image transmission; Environmental monitoring system comprised of meters and sensors that measure pressure, humidity, temperature and includes alarm and reporting functions; Global positioning system receivers; Downloadable computer firmware for embedded devices; Devices for wireless radio transmission; Gateway routers