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Health and safety monitoring of elderly citizens are key to the improvement of their quality of life, by enabling them to be more independent. This was the general motivation for developing the iSenior system presented in this paper. iSenior is a wireless embedded system solution for people living in rest homes that retain their mobility and, thus, move around the facilities and can even go outside. iSenior is a cyber-physical system solution that currently supports a set of functions like monitoring, alerting, and requesting assistance. The system has been implemented and is under field evaluation in a real world deployment. The aim of this paper is to provide information on the main features of the system, including architecture, implementation details, and performance evaluation.