TEC focuses on (bio)functionalization of surfaces, bioanalytical assays, design and integration of electrodes on flexible substrates, and the development of electrical and optical detection and acquisition modules. As Spain's leading private and independent research organization, TECNALIA is involved in four Demo Cases, leading two of them. Their activities include developing biosensing electrodes, biofunctionalization of polymeric surfaces, and designing wearable Li+ concentration monitoring devices. TECNALIA's approach involves surface modification, bioanalytical assay adaptation, and the development of optical detection modules, contributing significantly to the project's innovation and practical application.