Electronic Systems Technology, Inc., doing business as ESTeem Wireless Modems, designs, develops, manufactures, and markets industrial wireless products and accessories in the United States and internationally. The company's ESTeem industrial wireless products provide communication links between computer networks, network enabled devices, and mobile devices without cables. It also offers data radio products for process automation in commercial, industrial, and government arenas, as well as various accessories, such as antennas, power supplies, and cable assemblies. In addition, the company provides repair and upgrade services; and professional services, such as site survey testing, system start-up, and custom engineering. Its products are used in various applications, including water/wastewater, oil/gas, mining, and industrial automation. It markets its products through direct sales, sales representatives, and domestic, as well as foreign, resellers. The company was incorporated in 1984 and is based in Kennewick, Washington.