MuSA, Multi Sensor Assistant, is a wearable device designed for elderly people monitoring. The system provides healthcare services as a fall detector, a user alarm button, heartbeat, breathing rate and body temperature measurement. The full integration of MuSA in the ambient-assisted living framework CARDEA allows to provide the user with remote health monitoring, supporting independent and autonomous life at home. The paper illustrates the main concepts behind the MuSA device and presents details of single functionalities. Field tests have been carried out to ensure that the low-cost approach provides adequate quality of the system response.