ESI builds products that are easy to install, easy to understand and simple to use. All ESI products are designed with combined proprietary hardware and software platforms. ESI proudly engineers and manufactures its systems’ hardware in the United States. Software is created and maintained by senior-level ESI engineers and developers. ESI’s all-in-one phone systems deliver advanced operating performance through seamless feature integration. They are the “smartest” phones on the market, much less in their respective price ranges.