This proposal proposes the manufacture and clinical validation of a portable prototype (wearable device) for monitoring body volumes that allows real-time monitoring of the evolution of patients with heart failure (HF). Funding is requested for the manufacture of a portable device, as a final proof of concept, concluding the work carried out so far by the research groups involved, doctors and engineers, within the framework of other research projects. The manufacture of this device will also allow it to be validated in a clinical trial, before introducing its use in the clinic for the management of patients with HF, as well as specifying all the specifications of a first Minimum Viable Product (MPV) suitable for its industrial development.