One of the main modes of transmission and propagation of COVID-19 (SARS-CoV-2) is the direct contact with respiratory droplets transmitted among individuals at a certain distance . There are indoor spaces, such as dwellings, in which the transmission risk is high . This research aims to record and analyze risk close contacts in this scope, experimentally assessing the effectiveness of using electronic proximity warning sound devices or systems . For this purpose, the methodology is based on monitoring the location of the occupants of a dwelling . Then, the days in which a proximity warning sound system is installed and activated are compared to the days in which the system is not activated . The results stressed the significant reduction of time and number of close contacts among individuals when the warning was activated . Regarding the relation between the number and the duration of close contacts, together with the reductions mentioned, the possibility of making certain predictions based on the distributions obtained is proved . All this contributes to the progress in the prevention of COVID-19 transmission because of close contacts in dwellings.