The modern world is shaped by the increasingly rapid development of technology, which offers human civilization various opportunities to improve the quality of life, primarily by simply controlling the condition and health of the human organism, which is subjected to pressure and neglect due to a multitude of obligations due to a busy lifestyle. Therefore, as a quick and simple answer to the same, a technological solution is offered for the use of IoT devices, which offer the possibility of processing, analyzing and transmitting information if the devices are connected to the Internet. The collected data are used for drawing conclusions and taking further necessary steps. One of the examples of such devices are smart bracelets, and the "Fitness Tracker E66" and "GlobalSat LW-360HR" smart bracelets were used as part of this final work. They were developed to collect and process data during certain physical activities of the user, and that's how they monitor his vital signs and send him feedback about them. They are connected to the IT system and perform their tasks based on the principle of LoRaWAN technology. For the purposes of the practical part of this final work, heart rate measurements were made using the above-mentioned bracelets and the medically certified pulse oximeter "CA-MI", which demonstrated work principle of the bracelets and the reliability of their measurements. The measurements and comparisons have established a high level of reliability of the used smart bracelets, which is why they represent quality devices with which users can easily and quickly monitor their physical activities and general state of health, and surely such technologically developed devices will quickly find a place in the everyday life of every person.