This paper presents the design and implementation of a kit that involves a portable device and mobile application in order to detect and prevent ultraviolet radiation from any natural or artificial emission of UV rays, one of the invisible threats to human health. The prototype presents an adequate design in Arduino with low-cost components and portability for people, compared to other existing devices before the presentation of this article. The mobile application from the Android platform presents the data of the portable device during wireless connection with a friendly interface. Furthermore, the data from the prototype (UV index) are compared with the data of meteorological institute in the country http://126.96.36.199/IndiceUV2/. Such data, measurements in mW/cm2, are taken from the north and south key points in Guayaquil, Ecuador, a distance of 10.7 km, in an understandable period on the 7th of April 2019 to this present date. The information is lodged on the site https://github.com/brodriguezm998/UV-Reader.