The electromagnetic radiations impact on human beings is a controversial topic ever since the announcement of the 5G network deployment. This article presents a connected object to gather power measurements of the new 5G n78 band in France using low-cost components off-the-shelf (COTS). This object delivers to the user a 5G network exposure risk evaluation, comparing processed data to reference levels from medical studies and laws regarding the exposure to electromagnetic radiations. The results of this study demystify the general public exposure to 5G radiations from the n78 band.