Radio system comprising a wireless telephony system, a satellite tracking system, a specific alert processing center and at least one personal alert box (80) carried by a user and configured to communicate with said processing center alerts via said wireless telephone system, and said system being characterized in that said box comprises at least: - a memory unit containing at least one identifier of the housing, - a geolocation module (94) for each satellite, - at least one device for measuring a physical or chemical parameter； and a human-machine interface comprising (i) means (87a, b) for transmitting a signal for the user, and (ii) at least one control member (98, 99), said man-machine interface being configured to allow the user at least: ○ to trigger an alert, ○ to select at least one state from a state called "reachable user" and a state called "user not reachable", and ○ to prevent, at least for one predefined time, transmission of the alert triggered； and said box (80) being configured to transmit to the alarm processing center via the wireless telephone system following a triggering event a corresponding warning signal: ○ of the box identifier, ○ data of geolocation by telecommunication network and / or, if available, satellite geolocation data, ○ information characteristic of the triggering event, ○ information as to whether the box is in the "user reachable" configuration, or "User not reachable"； said triggering event being selected from the actuation of a control member by the user and the autonomous detection by at least one of said devices for measuring a physical or chemical parameter of the box. Système radioélectrique comprenant un système de téléphonie sans fil, un système de géolocalisation par satellite, un centre de traitement d'alertes spécifique et au moins un boitier (80) d'alerte personnel porté par un utilisateur et configuré pour communiquer avec ledit centre de traitement d'alertes par l'intermédiaire dudit système de téléphoni
